The Treaty of London is signed, ending the First Balkan War between the Balkan allies and the Ottoman Empire. The Ottomans cede all their European territories west of a straight line between Enos and Media and Albania becomes an independent nation.

The Treaty of London (1913) was signed on 30 May following the London Conference of 1912–1913. It dealt with the territorial adjustments arising out of the conclusion of the First Balkan War. The London Conference had ended on 23 January 1913, when the 1913 Ottoman coup d'état took place and Ottoman Grand Vizier Kâmil Pasha was forced to resign. Coup leader Enver Pasha withdrew the Ottoman Empire from the Conference, and the Treaty of London was signed without the presence of the Ottoman delegation. Further border changes were ratified in the Treaty of Bucharest in August 1913.