Innocentius III's attempt to have the crown returned to Sverker did not succeed. Sverker made a new military expedition, with Danish support, to Sweden, but was defeated and killed in the Battle of Gestilren in July 1210. The ancient sources state that "the Folkung [party] took his life". Responsible for the killing was his brother-in-law Folke Jarl, head of the Folkungs, who also succumbed in the battle. The site of the battle has engendered some discussion; while it is usually taken to have taken place in the parish of Varv in Västergötland, Gästre in Uppland has also been suggested. In spite of his hapless fate, Sverker II receives several kind words in the short chronicle included in the Law of Västergötland: "The sixteenth [ruler] was King Sverker, a wise and good fellow; the kingdom fared well from him. But the Folkungs took his life; his own brother-in-law did that to him at Gestilren. He rests in Alvastra, and the best things are always spoken about him". Family With his first wife, the Danish noble Benedicta Ebbesdatter (Galen branch of the Hvide family), b. , d. 1200), whom he married before 1190 when yet living in Denmark, Sverker had at least one well-attested daughter, Helena Sverkersdotter. There were possibly further children, such as Karl Sverkersson who according to Norwegian sources married a daughter of king Sverre of Norway and lost his life in 1198; his position is however doubtful, and if he was King Sverker's son he died in adolescence at the latest. There were possibly even two other daughters, Margaret and Christina, married to Witzlav of Rügen and Henry II, Lord of Mecklenburg ("Henry Borwin" in some later texts), respectively. The genealogical reconstruction is based on vague contemporary statements – however, Margaret and Christina may just have been Sverker's first wife's kinswomen. The second marriage in 1200 with Ingegerd Birgersdotter of Bjelbo, daughter of the Folkunge Jarl Birger Brosa, produced a son and heir, Jon (1201–1222), who was chosen king of Sweden 1216 as John I of Sweden. It has also been argued however that it is possible Ingegerd Birgersdotter was in fact Sverker's first wife, and Benedicta Ebeesdatter his second, and that possibly more of the evidence may point to this conclusion instead. His attested daughter Helena Sverkersdotter married (earl) Sune Folkason of the family of Bjelbo, justiciar of Västergötland. Their daughters Catherine of Ymseborg and Benedicta of Bjelbo