Documented from about 1140 onwards, the comital dynasty residing in Tyrol Castle near Meran held the office of "Vogts" (bailiffs) in the Trent diocese. They extended their territory over much of the region and came to surpass the power of the bishops, who were nominally their feudal lords. After the deposition of the Welf duke Henry X of Bavaria in 1138, the Counts of Tyrol strengthened their independence. When Henry the Lion was again enfeoffed with the Bavarian duchy by Emperor Frederick Barbarossa at the 1154 Imperial Diet in Goslar, his possessions no longer comprised the Tyrolean lands. The Counts maintained that independence under the rising Bavarian Wittelsbach dynasty. In 1210, Count Albert IV of Tyrol also took over the "Vogt" office in the Bishopric of Brixen, prevailing against the rivalling Counts of Andechs.