[All]: No other source mentions that Sveinn participated in the battle of Lyrskovshede. Knýtl (ÍF 34, 130) states: Þat er sǫgn sumra manna, at Sveinn Úlfsson hafi verit í þeiri orrostu með Magnúsi konungi ok sætt þeira heldisk þá enn ‘Some people say that Sveinn Úlfsson was in that battle with King Magnús and that their agreement was still in effect then’. Lyrskovshede is present-day Lürschau, some kilometres north of Schleswig (then part of Denmark).