June 15, 1389

Battle of Kosovo

Battle of Kosovo kills Sultan Murad I and Prince Lazar

Both supreme commanders were dead before the battlefield had produced a winner anyone could agree on.

15 June 1389, on Kosovo Field

An Ottoman army led by Sultan Murad I met the coalition assembled by Prince Lazar Hrebeljanović on Kosovo Field, near present-day Priština, on 15 June 1389 in the old calendar.

The TDV scholarly encyclopedia puts both forces at roughly equal strength, each slightly above 30,000, and warns that the transmitted figures are greatly exaggerated.

Vidovdan is now commemorated on 28 June — a commemorative tradition rather than a straightforward conversion of the medieval date.

Nobody agrees who won it

The fighting caused heavy losses and ended with both commanders dead. Sources disagree over the tactical outcome, with claims running from Christian victory to no victor at all to Ottoman victory.

Early Christian reports could describe a victory because Murad had died, while later Ottoman narratives emphasised Ottoman success.

There is no dependable casualty total for either side.

Who killed Murad

Murad was killed in an attack whose timing and circumstances vary between source traditions. In the Ottoman account assessed by the TDV encyclopedia, Lazar was captured and killed after Murad's assassination.

Later Serbian tradition names Miloš Obilić as the assassin and accuses Vuk Branković, who commanded Lazar's right, of betraying him. Early reports confirm Murad's violent death but do not securely establish the killer's identity, and the betrayal charge is not supported by reliable reconstruction.

Bayezid, who had commanded an Ottoman wing, succeeded his father; Lazar's minor son Stefan inherited under the regency of his mother Milica. Serbia was badly weakened, but it was not conquered on the field that day.

Sources

Researched 23 Aug 2026 5 sources not yet audited Date disputed

How this was checked

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Date disputed. Sources disagree about when this happened.

What the sources leave uncertain

The conventional date is 15 June 1389 in the old calendar. Modern Vidovdan commemorations occur on 28 June; accounts frequently conflate the historical date with the modern observance.
The tactical result is genuinely disputed. Early Christian reports could describe a victory because Murad had died, while later Ottoman narratives emphasized Ottoman success.
There is no dependable casualty total. Terms such as 'the bulk of both armies' should not be converted into numerical claims.
The identity of Murad's killer as Miloš Obilić and the familiar deserter-or-wounded-warrior stories belong to evolving later traditions, not a securely established eyewitness account.