He had a good relationship with the Duke Frederick of Bohemia (Czech: Bedřich), his cousin.
The bishop imposed an interdict on Děpolt's land (the regions of Čáslav, Chrudim and Vraclav).
[2] In 1189 Conrad II appointed Děpolt I to lead the Bohemian troop in the Third Crusade.
The Bohemian troop joined the crusaders led by the Holy Roman Emperor Frederick Barbarossa in Esztergom, Hungary.
Many of the Bohemian soldiers were former prisoners who were freed just to participate the crusade (8 of them were executed by Frederick Barbarossa because of their violence and robbery already in Serbia).