Óláfr may have been a patron of St German's Cathedral on St Patrick's Isle, as the chronicle reports that this religious house was constructed by Simon, Bishop of the Isles. The site itself appears to have been established in the twelfth- or thirteenth century. Early diocesan bishops, during the eleventh- and twelfth centuries, may well have circulated from region to region in the Isles, and it is possible that the cathedral's foundation represents the final settling of the diocesan see. The site has undergone several phases of construction over the centuries, and it is uncertain what part can be credited to Simon. Óláfr's actions in the northern Hebrides could indicate that he was also a patron of the Snizort Cathedral on Skeabost Island, a religious house that first appears on record in the fourteenth century.