Jakab was the son of Mihály, member of the clan Bána, and equerry of Andrew II of Hungary.
He became the swordbearer of the King Béla IV and held also the title Count of Trencsén.
gothic[citation needed] Castle of Csesznek in the Bakony mountains.
[citation needed] His sons, Miklós, Lőrinc, Szomor and Mihály were important[why?]
supporters of the Kings Ladislaus IV of Hungary and Charles I of Hungary and fought bravely against Máté Csák III, the powerful Hungarian feudal lord.