This alliance came apart after Harald's death. The jarls of Lade and various descendants of Harald Fairhair would spend the next century interlocked in feuds over power. As well as power politics, religion also played a part in these conflicts, as two of the descendants of Harald Fairhair, Haakon the Good ( and Olaf Tryggvason attempted to convert the then heathen Norwegians to Christianity. In the year 1000, Sveinn Hákonarson and Eiríkr Hákonarson (Old Norse: "Eiríkr") of Lade took control over Norway, being supported by the Danish King Sveinn Forkbeard ("Sveinn Haraldsson tjúguskegg"). In 1015, Olaf Haraldsson, representing the descendants of Harald Fairhair, returned from one of his Viking trips and was immediately elected as King of Norway. In June 1016, he won the Battle of Nesjar against the jarls of Lade.