レシェク1世
The alliance of his nephew with the Pomeranian ruler put Spindleshanks' rule in jeopardy, and he feared that he could lose the remain of his lands; so, he decided to make a pacific solution to his disputes with Odonic. On St. Martin's day (11 November) 1227 a solemn congress of Piast rulers, bishops and nobles in the small Kuyavian district of Gąsawa was convened, where this and others delicate issue were discussed in order to take further steps. In addition to the instigator of the reunion, Leszek I the White, were also present his brother Konrad I of Masovia, Henry I the Bearded, Wladyslaw Odonic (whose assistance is disputed by historians), the entire episcopate and numerous representatives of Polish magnate families. For unknown reasons, Władysław Spindleshanks didn't appear in Gąsawa, although is believed that both Archbishop Wincenty of Gniezno and Bishop Paweł II of Poznań watched his interests. Nobody expected the tragedy, which occurred on the morning of 24 November: during a short break between the deliberations in the town of Marcinkowo Górne, a group of Pomeranians attacked both Leszek I the White and Henry I the Bearded; Leszek I was killed and Henry I severely wounded, but did survive.