Joachim Chreptowicz was born on January 4, 1729 in the estate of Yasyanets of the Navahrudak Province (now in the Baranavichy district). He was a descendant of a old magnate family of Litavor-Hraptovichs with its roots in the 15th century. The name Litavor is thought to originate from crusaders as his ancestor was called after his homeland Lithuania (Litauer in German).
Members of the dynasty played an important role in the development of education and culture in Belarus, they held important posts in the bodies of supreme power and of local government. Joachim Chreptowicz was a representative of the dynasty’s eleventh generation.