His grandfathers were Buzád II Hahót, a loyal baron of Duke Béla and later Dominican martyr of the Christian Church, and Sal Atyusz, who held the position of ispán of Karakó ispánate in 1205.
Atyusz had three siblings: Thomas, who served as Archbishop of Kalocsa from 1254 to 1256, Sal, a clergyman, who was provost of the Dömös monastery from 1256 to 1295, and an unidentified sister, who married local nobleman Ant Lőrinte from Zala County.
The subsequent court at Segesd on 25 March, chaired by Denis' successor Peter Csák ruled in the favor of John based on an evidentiary procedure.
[6] Nevertheless, Atyusz remained a loyal supporter of Ladislaus IV of Hungary, who donated the village Pacsa (separating it from the castle of Zala) to him in 1283.
[8] When Andrew the Venetian, crossing the Austrian border, arrived to Hungary at the beginning of 1290 as a pretender to the throne, Atyusz was among the noblemen who joined his escort.
As loyal to the crown, Atyusz was appointed ispán of Vas County in 1291, however his dignity was purely nominal as the powerful Kőszegi family ruled de facto independently the western parts of Transdanubia by then.
His son John became the first member of the Szabari noble family, adopting the surname after his village Szabar which already owned by Buzád III in the 1230s.