This was the situation of affairs when, after King Eystein's death, the remnants of his and Sigurd Mouth's party rallied around the latter's ten-year-old son, Haakon, and demanded for him a third part of the kingdom. Inge answered by outlawing his nephew and all his adherents. Gregorius was at that time in Konghelle, occupied with defending the frontier against the rebellious partisans of Haakon who had found a refuge in Sweden, and Erling Skakke availed himself of his absence to approach the king. Although the relation between the two liegemen was constantly growing more strained, the common danger, to which they were exposed from Haakon's party, made them postpone hostilities. A decisive battle was at last fought between the latter and King Inge at Konghelle (1159), and Haakon was defeated. Both Erling and Gregorius were present and to their valor the victory was largely due. A very slight provocation was now needed to bring them into collision, and this was supplied by a quarrel between their men, which soon became a general fight, and would have become a battle, if King Inge had not personally interfered. In the meanwhile Haakon, who had gathered under his banner robbers, outlaws, and all sorts of adventurers, began to ravage the frontier shires in Viken, and the presence of Gregorius was again needed to keep him in order. He made an attack upon the estate of Haldor Brynjulfsson, Gregorius' brother-in-law, and the latter's sister, Sigrid, was compelled to flee in her night clothes from the burning house, carrying her five-year-old son in her arms. This wanton destruction Gregorius resolved to avenge, but during his pursuit of Haakon's robber band, he ventured too far out upon the insecure ice of the Bevje-Aa, fell through, and while struggling to get ashore was killed by an arrow (1161). King Inge wept like a child, when he heard of his friend's death, and swore either to avenge him or to die in the attempt. Scarcely a month had elapsed, when he was attacked by Haakon's band at Oslo, and fought a bloody battle upon the ice of the Folden Fjord. Here he fell, defending himself desperately, after having been deserted by King Gudröd of the Hebrides, who by his treason decided the battle in Haakon's favor (1161). Inge Crookback was the only one of Harold Gille's sons who was an honorable man. In spite of his physical weakness, he had courage and pluck, and a strong sense of loyalty to those who served him well. He was but twenty-five years old when he died.