Kliment Bosak

Kliment called Bosak according to their religious affiliation to the Franciscans with a possible surname Ursin was the author of texts, hymns active in the first half of the 16th century. In the Franciscan order, he worked as a preacher in Jindrichuv Hradec. As well as other religious at that time, however, he tended to the then newly emerging paradigm of Lutheranism and left the religious order, the ideas of the Reformation was clearly reflected in the song lyrics written by Clement (eg. Emphasis on the authority of the Bible, the denial of the saving power of human actions). Kliment, if this was his mundane (given) name, could be the same Jindřichův Hradec Franciscan preacher and supporter of Lutheranism Benedict of Pilsen (religious name), which in 1524 sought Franciscans of the Bechyně monastery in the confessional reasons, capture and close to the monastery prison.

https://cs.wikipedia.org/wiki/Kliment_Bosák