Although the chronicle seems to imply that Findguala was also Rǫgnvaldr's mother, at no point does the source state as much. In fact, there is evidence which strongly suggests that Rǫgnvaldr was the son of another woman. For example, the surviving fragments of a letter sent from Óláfr to Henry III, King of England in about 1228 reveal that Óláfr described Rǫgnvaldr as a bastard son of his father. Furthermore, the contemporary Gaelic praise-poem, "Baile suthach síth Emhna", declares that he was a son of Sadb, an otherwise unknown Irishwoman who may have been an unrecorded wife or concubine of Guðrøðr. The likelihood that Rǫgnvaldr and Óláfr had different mothers may well explain the intense conflict between the two men in the years that followed. This continuing kin-strife is one of the main themes of Rǫgnvaldr's long reign.