Rǫgnvaldr Óláfsson (fl. 1164)
…secured the kingship for himself. In 1155 or 1156, the chronicle reveals that Somairle conducted a coup against Guðrøðr, specifying that Somairle's son, Dubgall, was produced as a replacement to Guðrøðr's rule. Late in 1156, Somairle and Guðrøðr finally clashed in a bloody but inconclusive sea-battle. According…