Conrad I of Württemberg ("Konrad von Wirtinisberc, C(u) onradus de Wirdeberch") was the first ruler of the castle of Wirtemberg from 1083 to 1110, and is first mentioned in 1081.
About 1083 Conrad built a castle on the Wirtemberg close to today's Stuttgart.
Under his new name Conrad was a witness some time between 1089 and 1092 to the so-called Bempflinger Vertrag (treaty) of the counts Kuno and Liutold von Achalm with their nephew, count Wernher von Grüningen.
In both situations Conrad I appears closely connected to people who are opponents to Henry IV, Holy Roman Emperor.
This political stance is in agreement with the fact that he asked the Bishop of Worms, an opponent of the Emperor, to consecrate his chapel of the castle, in preference to the Bishop of Constance in whose territory the castle actually was situated.