I would be like Harald Hardrada , he fought as teenage to help his brother , after his brothers death Harald left Normandy into exile and did mercenary work . Traveled to Constantinople and joined the Byzantine emperors guard and became a wealthy commander .... went back to Normandy and fought for the throne and won. 2 years later went to invade England and one many battles there and died in the battle of Stamford Bridge during which Harald was later known as the last great viking warrior kings.