Peter Mohyla, a son of the Moldavian ruler, became the metropolitan of Kyiv in 1633 and worked hard to reform Ukrainian and Belarusian Orthodoxy. He began with the education of the clergy. In 1632, he merged two existing schools for Orthodox youth, establishing a Kyivan college—the first Western-type educational institution in Ukraine, modeled in structure and curriculum on the Jesuit colleges of the era. The Catholic reform, launched by Rome at the Council of Trent (1545–1563), became the inspiration and model for Mohyla’s reform of the Orthodox Church of the Commonwealth.

