Historian Pál Engel argued Ugrin was the son of Pós (or Pous), who served as Ban of Severin and Master of the treasury in 1235.
According to the contemporary Thomas the Archdeacon's Historia Salonitana, Ugrin was among those barons and prelates, who escorted the monarch to Dalmatia and entered Split (Spalato) then Trogir (Trau) in early 1242.
[9] Moreover, he [Ugrin] held both titles, that of archbishop and that of count [of Split]; yet, not content with these, he longed with all his heart for ever greater heights and riches.
Noble blood fed his conceit and the fire of youth his love of pomp, while his uncommonly tall figure and handsome face left him with no mean opinion of himself.
He was totally involved in secular matters, and gave scant attention to the affairs of the church, treating them as incidental and of minor importance.
He also attempted to deprive the canons of their rights altogether and to appropriate for his own use all four parts of the tithes; however, he was unable to prevail in the face of the opposition of the archdeacon [Thomas] and others.
He succeeded only in usurping the portion set aside for the poor, contrary to the custom of his predecessors.The presence of the royal court in Dalmatia during the Mongol invasion intensively affected the election of archbishops, and, consequently, the autonomy of Split.
Under the pressure of Béla IV, the chapter elected Ugrin Csák as the Archbishop of Split in 1244, when the city, under Matej Ninoslav, embroiled into conflict with Trogir.
[13] Archdeacon Thomas blamed Ugrin that he "behaved mildly and peacefully" towards the enemies of the city, while reserved his "full harshness and severity for his fellow citizens".
[11] According to Judit Gál, Thomas' antipathy (beyond personal involvement) reflects the difference between the Hungarian and Dalmatian role perceptions of the prelate.
[6] He was consecrated as archbishop by his suffragans, Treguanus of Trogir, Nicholas of Hvar, Bartholomew of Skradin and Philip of Senj in the Cathedral of Saint Domnius on 20 September 1247.
[3] Following his death, John Hahót, Bishop of Skradin was elected as archbishop by Ugrin's confidants, but the pope refused to confirm him and, instead, appointed Roger of Torre Maggiore in 1249.