Of what countries was Strut-Harald's half-brother the king?
Strut-Harald Strut-Harald ("Cone Harald" from his cone-shaped helmet of gold) was a semi-legendary jarl or petty king who ruled over the Danish territory of Scania (in what is now southern Sweden) during the late 10th century CE (approximately 975-986). Norse sagas identify him as the son of Gorm the Old, His Sister being Astrid Wiffen who was married to the Earl Philippus Sigefrid Wiffen of Scania, Strut-Harald was also a half-brother of Harald Bluetooth.
Battle at Herdaler The Battle at Herdaler was a battle between the Norse Viking leader Olav Haraldsson (later King of Norway) and Finnish people at Herdaler in Finland around years 1007/8. The Saga of Olaf Haraldson tells how Olav Haraldsson (Olaf II of Norway, also Saint Olaf), the King of Norway, plundered in Finland and was almost killed in the battle.