Before he became the Serbian Patriarch, Mojsije served as Metropolitan of Raška, from 1704, under Patriarch Kalinik I. That was traditionally a very prominent position, so when the next Patriarch Atanasije I died in 1712, Mojsije was elected as his successor. His seat was in the Patriarchal Monastery of Peć.[2]
By 1725, patriarch Mojsije decided, under the burden of old age and poor health, to transfer his authority to the Metropolitan of Raška, named Arsenije, who became new Serbian Patriarch. After abdication from the patriarchal throne, he spent the rest of his days in the Patriarchal Monastery of Peć and died there on 13 April 1726.
