[1][2] Walter was elected Bishop of Transylvania sometime after 1139, when his last known predecessor Baranus is mentioned in this capacity.
His name is also mentioned, when King Géza II confirmed this donation in the same year.
[2] Walter again acted as a testimony in March 1157, when Gervasius, Bishop of Győr interceded with Géza II to grant the collection right of salt duties to the archdiocese at Nána and Kakat (present-day Štúrovo, Slovakia).
[4] A non-authentic royal charter allegedly issued in 1158,[3] which contains that Géza II reissued the lost privilege letters of the Pécsvárad Abbey, mentions Walter as bishop too.
[4] According to the 18th-century historian Miklós Schmitth, Archbishop Martyrius asked Walter to embrace and support the Transylvanian Saxons, who were settled during the reign of Géza II.