Esaias Tegner was a 19th century Swedish writer and professor of Greek language. After writing Fridthjof's Saga Tegner was considered the father of modern Swedish poetry. Fridthjof's Saga dates back to the 8th century in Iceland. King Beli had two sons, Helgi and Halfdan, and a daughter named Ingeborg. On the other side of the fjord, lived the king's friend whose son Frithjof was called "the bold" and he was the bravest among men. Frithjof had been raised together with Ingeborg by their foster-father Hilding. Both Beli and Þorsteinn died in war whereupon Helgi and Halfdan ruled the kingdom. The two kings were jealous of Frithjof's excellent qualities and so they refused to let him marry Ingeborg. When Frithjof returned he burnt down Baldr's temple and went away and became a Viking. After three years, he came to king Ring. Just before the old king died, Frithjof's identity was apparent to everybody and the dying king appointed Frithjof Earl and made him the care-taker of Ring and Ingeborg's child. When Ring died, Frithjof and Ingeborg married and he became the king of Ringerike. Then he declared war on Ingeborg's brothers killing one of them and making the second his vassal.