His Romanian origin is mentioned by Giovanni de Marini Poli (the agent of Emperor Rudolf) in 1595 ("di natione Vallacha”), by Cosimo Capponi in 1596 ("è pure un povero Valacho"), by István Szamosközy and by the Franciscan friar Giuseppe Pisculo.

After the death of Farkas Kovacsóczy, he was appointed Chancellor of Transylvania (suppremus cancelarius) by Prince Sigismund Báthory.

[1][4] According to historian István Szamosközy, Jósika was responsible for the execution of his predecessor, because he wanted Kovacsóczy's office.

He besieged Temesvár (today: Timișoara, Romania) on 17 October 1597, but he was forced to retire ten days later.

Sigismund Báthory returned to Transylvania and marched into Kolozsvár (today: Cluj-Napoca, Romania) to retake his throne.

The prince accused him to want to obtain the power, as a result he was decapitated without judgement before gate of the Szatmár Castle.