He was the first bishop of the Diocese of Nyitra in the Kingdom of Hungary (today Nitra, Slovakia), which was re-established after its Great Moravian roots two hundred years ago.
According to an undated diploma extract preserved by the collection book Liber ruber in the Pannonhalma Abbey, a certain Gervasius was already styled as bishop of Nyitra.
[2] The diploma extract narrates that Moses, the ispán of Nyitra County intended to take the estate Sala along the river Váh (Vág) (today Šaľa, Slovakia) away from the Pannonhalma Abbey, which had previously granted the land from Stephen I of Hungary, and Gervasius was entrusted to judge over the litigation.
[1] According to historian László Koszta, his superior Lawrence, Archbishop of Esztergom was that prelate, who ordered Gervasius to investigate the case.
This and the place of the trial imply that Gervasius, as bishop of Nyitra acted on behalf of the archbishop in the matter of the disputed property located in the territory of the Archdiocese of Esztergom.