The details of Gilbert's consecration are unknown. It was during Gilbert's episcopate that Inchcolm Priory was elevated to the status of an abbey. The latter monastic establishment was in the diocese of Dunkeld because it had been an earlier Dunkeld foundation, dedicated, like Dunkeld Cathedral was, to Saint Columba, hence the name Insula Columbae, or in the vernacular, Innse Choluim, "island of Columba".
The details of Gilbert's consecration are unknown. During his time as bishop, Inchcolm Priory was elevated to abbey status. This monastic establishment was situated within the Dunkeld diocese because it had been a previous foundation in Dunkeld, dedicated like Dunkeld Cathedral, to Saint Columba, hence the name "Insula Columbae" or "Island of Columba".