Ladislaus IV and his court visited the episcopal see Csanád (present-day Cenad, Romania) in June 1278, where the rebellious Stephen Gutkeled swore loyalty.
The arriving papal legate Philip of Fermo summoned a general assembly in July 1279, which adopted the so-called Cuman laws in order to baptize and settle the nomadic people.
In addition, the laws recorded the place of the final settlement of the Cumans in the land, among others, between the rivers Temes (Timiș) and Maros (Mureș).
Pope Martin IV entrusted prelates John Hont-Pázmány of Kalocsa, Pouka of Syrmia and Gregory of Csanád to investigate the case in June 1282.
The three prelates ruled in favor of Thomas; thereafter Gregory participated in the consecration of the bishop alongside Archbishop John Hont-Pázmány.
[7] The Cumans also plundered the estates of local influential lord Thomas Csanád (although the document which narrates his ordeals is a non-authentic forgery), when his letters of donations were burnt and destroyed.
After the battle, Ladislaus IV instructed Gregory and his cathedral chapter to determine the estates of the lord by interrogating Thomas' relatives and neighbors.
[5] As a papal inquiry was carried out to find out "whether the king died as a Catholic Christian", Gregory transferred Ladislaus' body to his episcopal see, where he was buried in the St. George Cathedral of Csanád.