In authentic contemporary records, Buzád and his (unidentified) descendants were first mentioned in 1215, when a certain knight of the queen's court, Wilermus, sold his lands between the Mura and Drava rivers for 200 marks to them.

In February 1224, Pope Honorius III sent a letter to Buzád – still referred to with the title Ispán of Pozsony –, acknowledging his splendid allegiance to Duke Béla, risking his wealth and other goods and the dangers to which he was exposed by it.

On the same day, the pope wrote to King Andrew II, warning him not to harm the property of Buzád and the other lords, who took refuge at the court of Duke Leopold VI with Béla.

[11] After reconciliation between father and son, Buzád returned to Hungary in the spring of 1224, and became the Ispán of Vas County in 1225, which then belonged to the Duchy of Slavonia, the realm of Béla.

Nevertheless it is more likely that Buzád held the office of Ban of Severin, because of his close relationship with Béla, and there is also reason to believe he came into contact during that period with the Dominican friars, who were engaged in proselytizing among the Cuman people.

Without referring to specific dignity, Ban Buzád appeared as a member of the royal council along with several other partisans of Béla – for instance, Mojs and Denis Tomaj – in that year.

[15] For this reason historian Attila Zsoldos considered that Buzád left Béla's court to return Andrew's loyalty by that year.

He had grown up when he was trespassing his riches and fame, and he left his rank on his sons, and with great enthusiasm he commenced a monastic life in the Dominican order.

When the Tartars [Mongols] broke into Hungary, and they perished the servants of God with exceptional cruelty, the Prior commanded their monks to flee, but Buzád did not care about the threat to his life, asking him to let stay and console the Christian people.

[17] According to tradition narrated by a contemporary chronicler Thomas of Cantimpré, not willing to leave the monastery, the invading Mongols killed Buzád before the altar in the middle of April 1241, shortly after the disastrous Battle of Mohi.

[3] The narration of his martyrdom was preserved by Jesuit scholar and theologian Gábor Hevenesi at the end of the 17th century in his work Ungaricae Sanctitatis Indicia (1692).

[18] A lookout at Zajk Hill near Letenye ("Boldog Buzád Kilátó"), designed by Imre Makovecz and constructed after his death, is also dedicated to him.