The only other certain information about his life is that he was kept in captivity and blinded in the fortress of Nyitra (Nitra, Slovakia) in the last years of the reign of his cousin, King Stephen I of Hungary.

[7] According to the Illuminated Chronicle, King Stephen imprisoned Vazul and held him in captivity in the fortress of Nyitra (Nitra, Slovakia) in order to urge him to "amend his youthful frivolity and folly".

[8][9] In contrast with Györffy, his Slovak colleague, Ján Steinhübel has no doubt that Vazul was a Duke of Nyitra, who succeeded his brother, Ladislas the Bald before 1030.

[10] The theory that the "Duchy of Nyitra" was under Polish suzerainty in the first decades of the 11th century, which is based on the Polish-Hungarian Chronicle, is flatly refused by Györffy.

[12][13] Although Vazul who was Stephen's closest agnatic relative had the strongest claim to succeed him on the throne, the king disregarded him and nominated his own sister's son, Peter Orseolo as his heir.

[17] They sent an "evil man" to Nyitra who "put out Vazul's eyes and filled the cavities of his ears with lead"[8] before the king's envoys arrived.

[17] However, a report recorded in the Illuminated Chronicle has preserved the memory of Vazul's paternity of three sons named Andrew, Béla, and Levente.

[19] Likewise the Illuminated Chronicle writes that Vazul's wife was a member of the Tátony clan, but his marriage lacked legitimacy.