Kmita was one of the most trusted followers of Queen Bona Sforza for the establishment of national factions in Hungary against the Habsburgs and the fight of the nobility for privileges at the end of Sigismund Augustus reign.
He traveled to Hungary in support of John Zápolya, and entered the so-called triumvirate at Bőny, alongside Piotr Gamrat and Andrzej Krzycki.
He was a patron of culture, his court in Wiśnicz was one of the finest centers of Polish Renaissance, gathering the era of the best minds of lawyers, writers and poets.
Kmita financed the publishing of poems and writings by Klemens Janicki, Stanislaw Orzechowski, and courtier Marcin Bielski.
Petrus Cmitha comitus a Vyssnycze, palatinus et capitaneus Cracoviensi, regni Poloniae supremus marsalcus ac Scepusiensi, Premisliensi, Sandecensem et Colensi capitaneu (1540).