Военное училище эвэлпидов
Papadopoulos was born in Elaiohori, a small village in the Prefecture of Achaea in Peloponnese to local schoolteacher Christos Papadopoulos and his wife Chrysoula. He was the eldest son and had two brothers, Konstantinos and Haralambos. After finishing high school in 1937 he enrolled in the Hellenic Military Academy, completing its three-year program in 1940.