His grandfathers were Buzád II Hahót, a notable baron and later Dominican martyr of the Christian Church, and Sal Atyusz, who held the position of ispán of Karakó ispánate in 1205.
[1] Thomas was first mentioned in 1227 by a contemporary document, when he inherited the estate of Bersen from his maternal grandfather, Sal Atyusz.
[2] In the second half of 1254, Thomas Hahót was elected as Archbishop of Kalocsa, proving by a letter from Innocent's successor, Pope Alexander IV, dated 12 February 1255.
According to this, the Pope urged the canons of archdiocese, Lawrence of Kalocsa and Nicholas of Bács, to finance retrospectively the electoral process of Archbishop Thomas with borrowing 150 denari.
His brother Sal functioned as lector at the Bács Cathedral (today in Bač, Serbia), the second seat of the archbishopric during his term.