Sverre was too shrewd to break entirely or too suddenly with the old influences, and where they had been loyal, he selected men from the high old families for his officers. This was especially the case in the Throndhjem country, where his party was strongest. But he found positions enough with which to reward the faithful men who had followed him through his struggles. Some were made chiefs in the army, and some were appointed prefects; some were given landed estates, and others were helped to rich marriages. Baard Guthormson of Rein was married to the king's own sister, Cecilia, after her marriage with Folkvid Lawman had been declared void. King Sverre himself married Margreta, a sister of the Swedish king, Knut Erikson. Before this marriage King Sverre had four children, namely, two sons, Sigurd (called Lavard) and Haakon, and two daughters, Cecilia and Ingeborg. With Queen Margreta he had only a daughter, Kristina. The peace was not of long duration. The remnants of the Heklung party, which had been broken up by the battle in Norefjord, with several leading men, only waited for a favorable opportunity to start a revolt, and the opportunity soon offered itself. A monk, who called himself Jon and claimed to be a son of King Inge the Hunchback, left the cloister on the island near Oslo, and soon gathered about him a numerous band. He first went to Tunsberg, where, in September, 1185, he attacked and killed one of Sverre's prefects together with thirty men, and then summoned a Thing and was proclaimed king. The Birchlegs called this new party the Kuvlungs or Cowlmen, because their leader had worn a monk's hood or cowl. The Kuvlungs continued the rebellion for three years with varying success. They made several attacks on Bergen and Nidaros, and at times their strength was quite formidable. Finally their band was destroyed in Bergen, in December, 1188, and their leader was killed. After his death it appears to have been satisfactorily proven that Jon Kuvlung was not the son of King Inge the Hunchback, as he had claimed.