Brother Robert was a cleric working in Norway who adapted several French literary works into Old Norse during the reign of King Haakon IV of Norway (1217–1263). The most important of these, Tristrams saga ok Ísöndar, based on Thomas of Britain's Tristan, is notable as the only example of Thomas' "courtly branch" of the Tristan and Iseult legend that has survived in its entirety. It was the earliest Scandinavian version of the story, and is thought to be the first Norwegian adaptation of an Old French work. Its success may have inspired the spate of translations during King Haakon's reign.