After Frederick II returned to Italy in 1220, Henry was placed under the tutelage of Archbishop Engelbert I of Cologne, who crowned him German king on 8 May 1222, in Aachen. Despite the fact that Henry was formally betrothed to the Přemyslid princess Agnes of Bohemia, daughter of King Ottokar I of Bohemia, Engelbert planned his marriage with Isabella of England, one of the daughters of King John Lackland; however, this union never took place. After Engelbert's death in 1225, Duke Louis I of Bavaria took over the guardianship. The young King was mostly in the care of imperial "ministeriales". They also acted as administrators over his Swabian duchy. In the meanwhile, the betrothal between Henry and the Bohemian princess was cancelled.