Olelkovych

The House of Olelkovych (Belarusian: Алелькавічы, Lithuanian: Olelkaičiai, Polish: Olelkowicze, Ukrainian: Олельковичі) was a 15th–16th-century princely family from the Grand Duchy of Lithuania. Their main possession was the Duchy of Slutsk–Kapyl. They are sometimes known as Slutskys. They were descended from the Lithuanian Gediminids (male line) and Ruthenian Rurikids (female line). According to the 1528 military census, the family was the fourth wealthiest magnate family in the Grand Duchy. However, its influence declined after the Union of Lublin (1569). The last member of the family was Sophia Olelkovych Radziwill (1585–1612), wife of Janusz Radziwiłł. She was elevated to sainthood in the Eastern Orthodox Church in 1983. As part of her marriage negotiations, she insisted on remaining a member of the Eastern Orthodox Church, despite her future husband's allegiance to Calvinism. She died in childbirth, as did the child. After her death, her considerable wealth and the Duchy of Slutsk passed to the Radziwiłł family.