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.
Oldest Saga of St. Olaf The Oldest Saga of St. Olaf or the First Saga of St. Olaf is one of the kings' sagas. It is the earliest Norse biography of King Óláfr Haraldsson. Early scholars judged it to be among the very first sagas written, perhaps around 1160, but later scholarship has moved the date up to the end of the 12th century. One fragment with a hagiographic flavour was once thought to belong to the saga but more recent research indicates that it is from another text. Like other kings' sagas the "Oldest Saga" cites old skaldic poetry to decorate and verify the narrative.