 As early as 1477 a family treaty secured him the succession in Württemberg-Urach, which was ruled by Count Eberhard V, nicknamed "the bearded one", who left no legitimate offspring.In 1480 he took over rule from his father Count Ulrich V.
In 1482 he signed the Treaty of Münsingen with Eberhard V. This treaty reunited Württemberg by transferring power from Eberhard VI to Eberhard V of Württemberg-Urach.In return Eberhard VI was granted the succession to Eberhard V.
Thus from 1482 until the death of Eberhard V, he was nominally sovereign, but in reality he was powerless.