This established Halfdan 's claim not only to Raumarike , but also to half of Hedmark , the core of Sigtryg and Eystein 's kingdom .
He then defeated Sigtryg 's brother and successor Eystein , in a series of battles .
This established Halfdan 's claim not only to Raumarike , but also to half of Hedmark , the core of Sigtryg and Eystein 's kingdom .
He then defeated Sigtryg 's brother and successor Eystein , in a series of battles .