Career
He was also bishop of Tarnów (elevated in 1835). He also served as professor (1800–1827) and rector (1826/1827) of Lviv University. In 1835 Zachariasiewicz founded theological seminary in TarnóWest
His work focused on the history of the Christian Church, Poland, and Armenians.
He was a son of Abgaro Zachary and Helena Asiewicz-Passakasow. Her father Tomasz Asiewicz (former Osiewicz,LithAsevicius) is inscribed in encyclopedias of Polish nobles.
Franciszek"s uncle was bishop Grzegorz Zachariasiewicz (1740-1814).Many Zachariasiewiczes were Greek-catholic priests. Zachary (679-752) was the Rome Pope.