Joasaphus’ date of birth and early life are not known. He entered the [[monasticism|monastic]] life at [[Solovetsky Monastery]] on the White Sea and became [[hegumen]] at [[Pskov-Caves Monastery|Pskovo-Pechorsky Monastery]]. In January 1627, Joasaphus was appointed Archbishop of [[Pskov]] and Velikie Luki and developed a reputation for protecting the trade privileges of Pskov. He resisted the pretensions of the German merchants for which Patriarch [[Philaret (Romanov) of Moscow|Philaret]] admonished him. After Philaret reposed, Joasaphus was appointed his successor as Patriarch of Moscow. Joasaphus, as [patriarch]], did not involve himself in state politics as had Philaret.<ref> Francis Dvornik. ''The Slavs in European History and Civilization'', Rutgers University Press, New Bruswick, New Jersey, 1962 ISBN 0-8135-0403-1</ref> In church governance, however, Joasaphus was active. One of his first acts upon his enthronement was to severely punish Joseph Kurtsevich, the Archbishop of Suzdal, for his indecent behavior.
Joasaphus is noted for his efforts in the growth of the ecclesiastical printing activities in Moscow. Under under his supervision twenty three ecclesiastic books were published. He also published the Trebnik (in Russian: Требник - book of prayers) with a supplement of resolutions and decrees by Patr. Philaret.