[1][2][3] János Telegdy was born in Érsekújvár, Kingdom of Hungary (today Nové Zámky, Slovakia) in 1575 and ordained a priest in the Diocese of Esztergom on 10 February 1594.
[4][5] On 27 January 1610, he was appointed during the papacy of Pope Paul V as Bishop of Bosnia.
[4] On March 1619, he was appointed during the papacy of Pope Paul V as Bishop of Nyitra.
[4] In 1623, he was appointed during the papacy of Pope Gregory XV as Archbishop of Kalocsa.
[4] In 1624, he was once again appointed during the papacy of Pope Gregory XV as Bishop of Nitra.