In 1241, after the death of his father-in-law Henry II the Pious at the Battle of Legnica, Bolesław I supported his father's military seizure of Kraków, who this time was able to conquer the Seniorate. His rule lasted only two years, until the Battle of Suchodoły on 25 May 1243, when Konrad I was defeated and forced to retire to Sieradz.