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22 October 1454, at Erfurt

A surviving copy of the so-called 31-line Indulgence was issued at Erfurt on 22 October 1454 to Margaretha Kremer and her son Johann. It supplies the earliest precise surviving date associated with European typography.

The landmark object was not a book but a single vellum leaf about 21 × 26 cm: a preprinted form granting a plenary indulgence to contributors supporting the defence of Cyprus against an Ottoman siege, with blanks left for the purchaser's name, place and date.

Printed in bulk, finished by hand

The indulgence campaign needed many standardized documents, and movable type let the fixed Latin text be reproduced while the particulars were entered when each form was issued. The 31-line edition survives in multiple issued copies dated between 22 October 1454 and 30 April 1455 — the University of Copenhagen reports 46 known survivors.

Because this copy was issued hundreds of kilometres from Mainz, Princeton concludes the form must have been printed at least several days earlier: the date proves printing happened no later than 22 October, not that a press ran that day.

What the form does not say

The sheet does not name Gutenberg. Its workshop attribution rests on typographical evidence and historical reconstruction, so confident phrasing about 'the press of Johannes Gutenberg' claims more than the document itself supports.

Older scholarship cited 12 or 15 November 1454 before earlier copies were identified; the 22 October example is now the strongest precise terminus for European movable-type printing.

A date with nothing behind it

No surviving colophon, production record or contemporary testimony establishes that Gutenberg completed or published the Bible on 23 February 1455. The date is a modern traditional attribution rather than a documented day-level event.

Institutions date the object variously: the Library of Congress gives 1454–1455, its catalogue permits 1454–1456, and another Library of Congress account says printing was probably completed late in 1455.

What was actually made in Mainz

The work was a large-format Latin Bible printed in Mainz with movable metal type, predominantly in two columns of 42 lines, running to about 1,282 pages and requiring 290 different cast characters.

Estimates of the print run differ: at least 120 paper copies and perhaps as many as 40 on vellum, with a traditional larger estimate of roughly 180 copies. Printing, rubrication, illumination, binding and sale were separate stages — which is part of why a single publication day is so hard to define.

The letter that outranks the anniversary

A letter written by Enea Silvio Piccolomini — the future Pope Pius II — on 12 March 1455 reports that he had seen printed gatherings from a Bible, probably at Frankfurt in October 1454. That proves sheets were circulating before the traditional February date, without identifying any completion day.

One further correction: this was not the first book printed with movable type anywhere. East Asian movable-type printing predates it by centuries, so the defensible claim is the first great large-format book printed with movable metal type in Western Europe.

Friday, 3 August 1492: out of Palos

On 3 August 1492, Christopher Columbus departed Palos with three vessels — Niña, Pinta and Santa María — about half an hour before sunrise, according to the surviving journal summary, and steered first toward the Canary Islands.

Martín Alonso Pinzón commanded the Pinta and his brother Vicente Yáñez Pinzón the Niña, while Columbus sailed in the flagship Santa María. The three should not all be called caravels: Santa María was a larger nao.

Sailing for the Indies

Columbus's stated objective was to proceed from the Canaries until he reached the Indies and delivered the Castilian monarchs' embassy to Asian rulers. The Catholic Monarchs had authorized the westward expedition in the Capitulations of Santa Fe, and Palos had been ordered to supply two vessels.

By that evening the three-ship expedition was at sea heading south toward the Canary Islands. The transatlantic leg did not begin at Palos: the ships refitted in the Canaries and left from there in September.

What survives of the record

Columbus's original shipboard journal is lost; the familiar text is chiefly Bartolomé de las Casas's later abstract, which sometimes shifts between summary and apparent quotation. Crew totals differ among reconstructions because no complete, uncontested muster roll survives.

May 1498: arrival off the Malabar Coast

Vasco da Gama's Portuguese fleet reached the vicinity of Calicut — modern Kozhikode — after crossing the Indian Ocean from Malindi with a pilot obtained there. Scholarly histories generally date the arrival or anchoring to 20 May 1498; the 17 May often printed appears to describe the first sighting of the Indian coast.

The four ships had left Portugal about nine and a half months earlier, and the landing area at Kappad lies roughly 15 kilometres north of Calicut itself.

Two Tunisians and a shore party

The expedition's account says the Portuguese sent Fernão Martins ashore because he knew some Arabic. He encountered two Muslims from Tunis who could speak Castilian and Genoese — a more specific episode than accounts describing a single unidentified 'Arab merchant.'

The surviving Roteiro is an anonymous participant's account traditionally associated with Álvaro Velho, and personal names vary between translations.

Not a discovery, and not a monopoly

What the voyage completed was the first documented direct sea passage from Europe to India around the Cape of Good Hope. It was not a European 'discovery' of India, which had long-standing commercial connections with Africa, the Middle East and Europe.

The fleet's arrival opened direct contact with Calicut's multilingual trading community, and within days the Portuguese sought an audience with the Zamorin — but the arrival produced no monopoly and no uncontested trading position.

13 August 1521: the last position falls

On Tuesday 13 August 1521 — the feast of Saint Hippolytus, a date Cortés himself recorded — the Spanish-Indigenous coalition overran the Mexica defenders' remaining position in Tlatelolco, Tenochtitlan's neighbouring twin city.

Months of encirclement, fighting, hunger and disease had compressed the remaining defence into Tlatelolco while the coalition's brigantines controlled Lake Texcoco. Cuauhtémoc and other nobles attempted to leave by canoe.

Taken on the water, not surrendered

García Holguín's brigantine intercepted the canoe. As crossbowmen took aim, its occupants signalled that the ruler was aboard so they would not shoot; Holguín's men seized Cuauhtémoc, Tetlepanquetzal of Tlacopan and other nobles and brought them to Cortés.

By Cortés's own report, Cuauhtémoc said he had done all he was obliged to do in defence of himself and his people, then indicated Cortés's dagger and submitted to his decision. That account comes from a self-justifying letter to Charles V and is not a verbatim transcript.

What ended and what did not

Cortés wrote that the war ceased immediately once Cuauhtémoc was made prisoner. Organized defence of Mexico-Tenochtitlan and Tlatelolco was over, while survivors faced violence, captivity, displacement and occupation of the ruined city.

Cuauhtémoc was captured, not killed: Cortés held him prisoner until 1525. Nor did the defeat instantly incorporate Mesoamerica into a settled colonial state — conquests, negotiations, rebellions and institutional consolidation continued, and large autonomous Indigenous forces had been essential to the coalition that won.

Saturday, 6 September 1522

On Saturday, 6 September 1522, Victoria entered the bay of Sanlúcar de Barrameda under Juan Sebastián Elcano's command, completing a continuous westward circuit of the globe. Antonio Pigafetta reported that only eighteen members of the sixty-person crew that had left the Moluccas remained, most of them ill.

The named returning Europeans included Elcano, Pigafetta, the pilots Francisco Albo, Miguel de Rodas and Juan de Acurio, Hans of Aachen, and the page Juan de Zubileta. The ship carried on up the river to Seville two days later, on 8 September.

One ship out of five

Victoria was the only one of the expedition's five ships to complete the circuit and return to Spain. It had reached the Moluccas alongside Trinidad and sailed home alone only after Trinidad developed a serious leak and attempted a different route.

Elcano took Victoria west across the Indian Ocean, rounded the Cape of Good Hope, and escaped Portuguese detection after a dangerous stop at Cape Verde — where thirteen crewmen were detained only weeks before home came into sight.

What the count leaves out

The ship returned heavy with a commercial cargo dominated by cloves: 381 sacks, recorded at a net 524 quintals and 21½ libras. Spain now had direct proof that a ship could complete a global circuit by continuing westward.

The famous eighteen counts returning European expedition members; scholarship notes several Moluccan men aboard whom Pigafetta's list omits, with sources differing between three and four.

1525: a hanging in the Acalan lowlands

In 1525, during Cortés's arduous expedition toward Las Hibueras, the captive former Mexica ruler Cuauhtémoc was executed somewhere in the Maya province of Acalan-Tixchel. Cuauhtémoc and Tetlepanquetzal, the lord of Tlacopan, were hanged on Cortés's orders; Indigenous pictorial tradition represents them hanging from a ceiba or pochote tree.

The year is well attested, but the precise day rests principally on later chronicling: a recent UNAM treatment notes that 28 February, Carnival Tuesday, is the date given by Bernal Díaz del Castillo.

A conspiracy that cannot be verified

Cortés said an informant accused Cuauhtémoc and other Indigenous lords of planning to kill the Spaniards and start a wider revolt, and used that alleged plot to justify imposing death sentences.

Cortés and Bernal Díaz gave differing accounts of how the plot was supposedly exposed. Whether a genuine conspiracy existed — or whether Cortés exaggerated one to justify the killings — cannot be established from the partisan Spanish accounts that preserve it.

What the killings removed

The execution ended the life of the last independent huey tlatoani of Mexico-Tenochtitlan after more than three years in Spanish custody — far from that city, in the middle of a jungle march.

At least one other senior Triple Alliance ruler died with him, removing prominent captive leaders and frightening the remaining Indigenous members of the expedition as it continued through the Maya lowlands. Sources differ over which additional nobles were executed, and even the exact site within Acalan-Tixchel remains uncertain.

1543: printed by Petreius at Nuremberg

Johannes Petreius printed the first edition of Nicolaus Copernicus's six-book De revolutionibus orbium coelestium in Nuremberg in 1543. Georg Joachim Rheticus, who had persuaded Copernicus to allow publication and carried the manuscript to the press, initially supervised the printing.

The familiar 21 March anniversary is not supported: no reliable source consulted gives that day. Cambridge's history-of-science exhibit says March 1543, while a surviving presentation copy bears Rheticus's date of 20 April 1543 — so the defensible date is the year itself.

The anonymous address readers met first

When Rheticus left Nuremberg for an academic appointment, Andreas Osiander took over supervision — and added an unsigned address to the reader presenting the book's astronomical constructions as calculating hypotheses. Neither Copernicus nor Rheticus had intended it, and Copernicus's own dedication was more assertive.

So Copernicus's name stood on the title page while an anonymous editor controlled the first words readers encountered.

A moving Earth inside perfect circles

The work offered a mathematically developed system in which Earth rotates and travels around the Sun, displacing it from the stationary center of conventional geocentric astronomy. It did not replace Ptolemaic astronomy with the modern solar system: Copernicus retained uniform circular motions, compound circles, and a finite sphere of fixed stars.

Nor was this heliocentrism's first disclosure — the Commentariolus had circulated in manuscript and Rheticus published the Narratio prima in 1540. Publication made the mature system available in full shortly before Copernicus's death; the story of a finished copy reaching his deathbed is tradition rather than documented fact.

29 April 1769: enrollment, not grant

On 29 April 1769 Watt caused the technical specification for his already-granted patent to be enrolled in the High Court of Chancery. The letters patent themselves — number 913 — bear the date 5 January 1769; British grant and later enrollment of the specification were distinct legal steps.

The grant had required Watt to enroll a particular description of his invention within four calendar months. He prepared it with advice from associates including Matthew Boulton and William Small, and filed with days to spare.

Principles, deliberately undrawn

The specification described a method for reducing steam and fuel consumption, opening with what amounted to thermal discipline: the working cylinder should remain as hot as the steam entering it. It specified condensing steam in vessels separate from the working cylinder, keeping those vessels cold, and drawing off air and uncondensed vapor with pumps or equivalent means.

It contained no drawings — a deliberate effort to claim governing principles rather than tie the patent to one detailed machine layout. Patent 913 accordingly covered several fuel-saving principles, not solely a detachable component.

A record that mattered later

Nothing commercial began that day: no Boulton & Watt production enterprise, no mature engine. What Watt achieved was satisfying the disclosure condition before his deadline, putting on record the principles whose legal scope would later sit at the center of licensing and infringement litigation.

The original monopoly ran fourteen years; under the 1775 Act, protection was extended to June 1800.

9 March 1776: two volumes from Strahan and Cadell

The first edition of An Inquiry into the Nature and Causes of the Wealth of Nations was published in London on 9 March 1776 by W. Strahan and T. Cadell. It came as two quarto volumes: Books I–III filling 510 pages, Books IV–V running longer at 587.

The title page advertised Smith not as an economist but as an LL.D., fellow of the Royal Society, and former professor of moral philosophy at Glasgow. The date comes from Edwin Cannan's bibliographic introduction and is widely accepted, though the title page itself prints only the year.

No preface, no index

Unlike later editions, the first had neither preface nor index; its complete table of contents sat at the beginning of volume one. An index was added only in Smith's substantially revised third edition.

The print run is uncertain: modern bibliographic descriptions estimate either 500 or 750 copies. Four further editions appeared in Smith's lifetime, in 1778, 1784, 1786 and 1789.

What actually changed that day

The dated change was bibliographic: a finished five-book system of political economy entered public circulation after roughly a decade of composition. No identifiable overnight shift in British economic policy followed.

One detail of timing is worth holding onto: Smith published his analysis of colonial policy and the 'American disturbances' less than four months before the Declaration of Independence.

19 October 1781: the Articles of Capitulation

On 19 October 1781, Washington, Rochambeau, Cornwallis, and British naval commander Thomas Symonds completed and signed the Articles of Capitulation governing the surrender of York and Gloucester. The articles required two British redoubts handed over at noon, and artillery, arms, the military chest, and public stores delivered intact.

Article I split the prisoners between the allies: British land troops became prisoners of the United States, while British naval personnel and mariners became prisoners of the French.

The march to Surrender Field

That afternoon most of the British army marched between lines of American and French troops — facing ranks stretching more than a mile — to Surrender Field and laid down its arms.

Cornwallis, reportedly ill, did not lead the ceremony; Brigadier General Charles O'Hara represented him, and Washington designated Major General Benjamin Lincoln to receive the formal surrender. The tradition that the British band played 'The World Turned Upside Down' is not a securely documented fact of the day.

Trapped, then too late to save

French control of the Chesapeake had blocked reinforcement or evacuation, allied siege works and bombardment had reduced the defenses, and a storm had wrecked Cornwallis's attempted escape across the York River. He requested a ceasefire on 17 October; negotiations followed on the 18th.

About 8,000 men surrendered; approximately 17,000 American and French troops had surrounded Yorktown in early October. A British relief expedition of 5,000 troops sailed from New York that same day — and the definitive Treaty of Paris was not signed until 1783.

Three dates, one that is not the event

The U.S. State Department dates official British recognition to the definitive treaty signed on 3 September 1783 — not to 3 February. That February date was the reference point used to calculate phased cessations of hostilities after Britain and France exchanged ratifications of their preliminary peace; the American commissioners issued their own declaration of cessation on 20 February.

Recognition can be discussed at more than one stage, because the provisional Anglo-American articles of 30 November 1782 already contained Britain's acknowledgment of independence — but those were conditional on an Anglo-French peace, and 3 February is the date of neither Anglo-American signing.

3 September 1783: what Article 1 actually said

At Paris, the British plenipotentiary David Hartley and the American commissioners John Adams, Benjamin Franklin, and John Jay signed the definitive peace treaty. Article 1 did not merely name 'America': it listed all thirteen states one by one before acknowledging them free, sovereign, and independent, relinquishing British claims to their government, property, and territory in the name of George III, his heirs and successors.

The ten articles also fixed boundaries, recognized specified American fishing rights, and addressed debts, Loyalist property, prisoners, and British withdrawal.

Signed, then ratified the following year

This was a bilateral instrument. France, Spain, and the Dutch Republic were not parties; their settlements with Britain were separate documents, and the definitive Anglo-Dutch treaty was not signed until 20 May 1784.

Ratification followed the signature by months: Congress ratified on 14 January 1784, and the two parties exchanged ratifications in Paris on 12 May 1784.