Lew Sapieha
Lew Sapieha was a Polish nobleman and statesman of the Grand Duchy of Lithuania. He became Great Secretary of the Grand Duchy of Lithuania in 1580, Great Clerk of the Grand Duchy in 1581, Court Chancellor in 1585, Grand Chancellor from 1589 until 1623, Voivode of Vilnius in 1621, Great Lithuanian Hetman in 1623 and governor of Sonim, Brest and Mogilev. He was of Ruthenian ethnicity, however, modern Belarusian sources interpret his Ruthenian heritage as Belarusian
He was born in Astrouna , near Vitebsk. He was educated in Leipzig and worked in the royal chancellery of King of Poland and Grand Duke of Lithuania Stefan Bthory under direction of Jan Zamoyski. Raised Eastern Orthodox, in his youth he converted to Calvinism and founded a number of Calvinist churches in his former estates. In the 1570s he turned to Unitarianism. Disillusioned by the squabbles within the Protestant camp, in 1586 he converted with his first wife to Roman Catholicism of which he became a zealous defender. After the Union of Brest he enforced conformity on the unwilling Eastern Orthodox.
Source: Wikipedia