Early life
At age 20 in 1906, Dawid Józef Grün left Plonsk, Poland, then part of the Russian Empire, for Palestine. His father Avigdor Ben Gurion instilled a Zionist identity in him. In Palestine, he worked on farms and joined the Zionist movement, adopting the Hebrew name David Ben Gurion in 1910.
He later studied law at Istanbul University and the University of Warsaw. His Zionist activism led to expulsion from Palestine by the Turkish government during World War I, after which he enlisted in a Jewish battalion of the British army to help liberate the region.