Olof Trätälja was the son of the Swedish king Ingjald illråde, ruler of the House of Yngling in the 7th century according to Ynglingatal, a Skaldic poem detailing the kings of that house.
Domalde, Dómaldi or Dómaldr was a legendary Swedish king of the House of Ynglings, cursed by his stepmother, according to Snorri Sturluson, with ósgæssa, "ill-luck". He was the son of Visbur.
Olof Trätälja
…rebelled against Olof, surrounded his house on the shores of lake Vänern and burnt it down him inside it as a sacrifice to Odin, just as his ancestor Domalde had been sacrificed to end the poor harvests under his reign. However, Historia Norwegiae says that Olof succeeded his father and ruled as the king of…
Midvinterblot (1915) by Carl Larsson, which depicts the offering of king Domalde