The Chronicle of The Kings of Norway
Part 66 - King Olaf The Swede
The king thereupon returned north to Viken, and had all the royal revenues up to the Gaut river; and all the people of the country there had submitted to him. King Olaf the Swede had so great a hatred of Olaf Haraldson, that no man dared to call him by his right name in the king's hearing. They called him the thick man; and never named him without some hard by-name.