Krzysztof Morsztyn Sr. (1522–1600) of the Leliwa coat of arms, was founder of the Polish Brethren community in Filipów in 1585.

He was father of:

• Krzysztof Morsztyn Jr. (c.1580–1642) who taught at the Racovian Academy.
• Elżbieta Morsztyn who married Fausto Sozzini in 1586, but died within a year, after giving birth to a daughter, Agnieszka Sozzini, later mother of Andrzej Wiszowaty.