Odon's name appeared for the first time as a signatory in a document issued on 21 May 1161 at Łęczyca, the location of the first Polish Sejm.
Additionally, the High Duke had attempted to force Odon to become a priest in order to eliminate him from the succession.
As well, Odon wanted to have some land and found an opportunity to conquer the Duchy of Greater Poland.
Enlisting the aid of the Pomeranians, he not only recovered Greater Poland but also expanded it to include Gniezno and Kalisz.
[2][3] They had 3 children: Since Odon's son Władysław was too young to reign, Odon bestowed the regency of his duchy in the south of Greater Poland upon his half-brother, Władysław III Spindleshanks, while Mieszko III reclaimed the Duchy of Kalisz.