The following account of Maremmeh's patriarchate is given in the Chronicle of Seert: This father was originally from Arzun.
After studying at the School of Nisibis, he became a monk in the monastery of Mar Abraham, where he lived in a cell from which he never emerged.
His predecessor the patriarch Ishoʿyahb wrote to the inhabitants of Jundishapur, who had asked him for a metropolitan for their country, praising the virtues of this father, who was then bishop of Nineveh.
Three years after his consecration, during a visit to Karkha d'Gedan, he fell ill as a result of the hardships of the journey and the heat.
Some historians say that the Moslems worked to make him catholicus because, when he was bishop of Nineveh at the time of the conquest, he had brought them food during their invasion of the Mosul region.