Marcin Białobrzeski

He was a representative of the clergy in 1573 at the Sejm (parliament), and after the coronation of Henry of Valois as King of Poland on 13 February 1574, he delivered an oration at the funeral of Sigismund August.

In March 1576, Białobrzeski went with Krzysztof Lanckoroński to Vienna to an embassy of Emperor Maximilian to tell him about the newly elected King, Stefan Bathory.

In 1580, Białobrzeski went to Rome on a diplomatic mission and he served as the King's representative at the funeral of his brother, Christopher Báthory.

At the 1585 Sejm, he was part of the faction defending the execution of the nobleman Samuel Zborowski in the previous year.

[citation needed] He is considered to be the author of 19 works, including the first Catholic homily in Polish and several books about comparative religion.