Vratislaus, an ally of Henry IV, will support the Emperor in both the Investiture Controversy against the popes and the rebellions in Saxony that are to dominate his long reign.

Pope Gregory VII, having already gained the support of Boleslaw II of Poland, is keen on roping in the duke of Bohemia to surround the emperor with adversaries fighting for the church.

The pope confirms Vratislaus in the privilege of wearing the miter and tunic, which his predecessors had had.

The pope also expresses gratitude for the regular payment of tribute to the Holy See.

Vratislaus is often at odds with his brother Jaromír, the bishop of Prague, and he wears his religious vestments around the bishop to irritate him.

Jaromír, for his part, ignores the creation in 1063 of a new Moravian diocese at Olomouc by Vratislaus, who raises John, a monk of Brevnov, to the see.

Jaromír is resentful of the loss of tithes and fiefs and the brothers enter into a long rivalry.

Jaromír even attacks the new bishop of Olomouc and carries off by force of arms the relics which had been removed from Prague to the new see.

Vratislaus, for his part, spites his brother by wearing his episcopal vestments—an honor conferred by the pope for the price of one hundred marks per annum—in his brother's presence at official functions.

Despite the pope's support for Vratislaus' new see, the Bohemian duke is unswayed in his loyalty to the emperor.