Asta, the daughter of Gudbrand, soon after the fall of Harald Grenske
married again a man who was called Sigurd Syr, who was a king in
Ringerike. Sigurd was a son of Halfdan, and grandson of Sigurd Hrise,
who was a son of Harald Harfager. Olaf, the son of Asta and Harald
Grenske, lived with Asta, and was brought up from childhood in the house
of his stepfather, Sigurd Syr. Now when King Olaf Trygvason came to
Ringerike to spread Christianity, Sigurd Syr and his wife allowed
themselves to be baptized, along with Olaf her son; and Olaf Trygvason
was godfather to Olaf, the stepson of Harald Grenske. Olaf was then
three years old. Olaf returned from thence to Viken, where he remained
all winter. He had now been three years king in Norway (A.D. 998).