Patriarchal Tenure under Ottoman Rule
Jeremiah governed the Church of Constantinople during the reign of Sultan Suleiman the Magnificent, when the Ecumenical Patriarchate operated under Ottoman authority. Sources describe him as a man of great administrative skill who, despite a lack of formal education, strengthened the Church and worked to restore its sacred places.
Soon after his election in 1522 he traveled pastorally through Cyprus, Egypt, Sinai, and Palestine, a journey that took him away from the capital and into the territory of the other ancient patriarchates.
His most noted act of governance came in 1537, when he obtained a sultanial order halting the conversion of churches into mosques in Constantinople. The measure offered protection to the Church's buildings, but it was not confirmed by his successors and effectively ended after the death of Suleiman in 1566.