Snorri Sturluson,
Heimskringla — Saga of Magnus the Blind and of Harald Gille
“ Then Sigurd stood up, spoke to those who were standing on the king's pier, made known to them the murder of King Harald by his hand, and desired that they would take him, and choose him as chief according to his birth. Now came many swarming down to the pier from the king's house; and all with one voice replied, that they would never give obedience or service to a man who had murdered his own brother. "And if thou are not his brother, thou hast no claim from descent to be king." They clashed their weapons together, and adjudged all murderers to be banished and outlawed men. ”
