Ulrich X (also called Ulric or Udalrich) ( –1097) was Count of Bregenz from 1079 to his death in 1097.

Life Ulrich X was the son of Ulrich IX of Bregenz (d. 1079).Zösmair, ‘Geschichte Rudolfs des letzten,’ p. 27. In late 1080 or early 1081 Ulrich married Bertha of Rheinfelden, daughter of Rudolf of Rheinfelden.Zösmair, ‘Geschichte Rudolfs des letzten,’ p. 27. When he met Bertha, Ulrich was already betrothed to another woman, a daughter of Count Werner of Habsburg (d. 1096). Yet he and Bertha began an affair, and when her relatives found out, they compelled Ulrich to marry Bertha.Casus Monasterii Petrishusensis, III.26, p. 655.

During the Investiture Contest, Ulrich was on the papal side, allied with Rudolf of Rheinfelden and Welf I, Duke of Bavaria.Beach, Trauma of Monastic Reform, p. 127. With the permission of Pope Gregory VII He founded the abbey of Mehrerau in Bregenz.Zösmair, ‘Geschichte Rudolfs des letzten,’ p. 28. Ulrich was also engaged in a long-running dispute with the monastery of Petershausen over property in Bigenhausen which he had appropriated from the monks.Beach, Trauma of Monastic Reform, pp. 126-7.

In 1097 Ulrich died while on a hunting trip in Prättigau. Members of the hunting party began rolling stones down a hill and Ulrich, in a show of bravado, tried and failed to jump one of the stones. He died from the injuries he sustained and his body was taken back to Bregenz for burial.Casus Monasterii Petrishusensis, III.26, p. 655.

Children With Bertha, Ulrich X had the following children:Zösmair, ‘Geschichte Rudolfs des letzten,’ p. 29. Rudolf I, Count of Bregenz Ulrich XI Henry of Kellmünz (d. 1128) Adelaide (d.28 June 1168), married Ulrich, count of Ramsperg and Hegau (d.c.1155)Casus Monasterii Petrishusensis, VI.20, p. 681.

Notes

References Casus monasterii Petrishusensis, ed. O. Abel and L. Weiland, MGH SS XX (1869), pp. 624–683 Historia monasterii Marchtelanensis, MGH SS XXIX, pp. 660–683 Berthold of Zwiefalten, Chronicon, in L. Wallach, ‘Berthold of Zwiefalten's Chronicle,’ Traditio 13 (1957), pp. 187–233. A.I. Beach, The Trauma of Monastic Reform: Community and Conflict in Twelfth-Century Germany (Cambridge, 2017). J. Zösmair, ‘Geschichte Rudolfs des letzten der alten Grafen von Bregenz (1097–1160),’ Schriften des Vereins für Geschichte des Bodensees und seiner Umgebung, 44 (1915), 25–39.