Boris III was born on January 30, 1894, and became Tsar after his father, Tsar Ferdinand I of Bulgaria, abdicated amid the growing pressures from the war and political strife. This transition occurred just weeks before the end of World War I, a time filled with uncertainty and significant change for Bulgaria. Boris was determined to lead the country away from the severe social and economic impacts of the conflict and to re-establish Bulgaria as a significant player in the Balkan region.

Educated largely in Western Europe, Boris III had a vision for a modern Bulgaria and sought to balance various political factions within the country. He initially faced challenges from both the military and civilian political leaders, all while navigating the end of World War I, which had left Bulgaria defeated and on the verge of national crisis. His governance style was characterized by a mix of traditional monarchy and modern authority, attempting to consolidate power in the monarchy while responding to the needs of his people.

Boris's ascension marked the beginning of a substantial period in Bulgarian history, transitioning from the tumultuous wartime conditions to attempts at establishing peace and stability. He worked on revitalizing Bulgaria’s economy, improving infrastructure, and developing relationships with neighboring countries. His reign ultimately placed Bulgaria in a position to debate its future direction in the interwar period, setting the stage for the subsequent political developments in the country.