Boris III, originally Boris Klemens Robert Maria Pius Ludwig Stanislaus Xaver, was the Tsar of the Kingdom of Bulgaria from 1918 until his death in 1943.
Boris III of Bulgaria
Crown Prince Boris (2nd from right) and German field marshal Von Mackensen reviewing a Bulgarian regiment accompanied by the Commander in Chief General Zhekov and the Chief of Staff Army General Zhostov during World War I
King Boris' manifesto of ascension to the throne
The Royal Sceptre of Boris III
The Tsardom of Bulgaria, also referred to as the Third Bulgarian Tsardom, sometimes translated in English as the "Kingdom of Bulgaria", or simply Bulgaria, was a constitutional monarchy in Southeastern Europe, which was established on 5 October 1908, when the Bulgarian state was raised from a principality to a tsardom.
Ferdinand I of Bulgaria at the proclamation of Bulgarian independence, 1908
Boundaries on the Balkans after the First and the Second Balkan War (1912–1913)
Areas where Bulgarians were the majority of the population (in light green) according to Anastas Ishirkov (1912).
Bulgarian officers on the Macedonian front