Haziga of Diessen, also known as Hadegunde (c. 1040 – 1 August 1104) was a Countess consort of Scheyern. Her descent is not entirely clear. It is usually assumed that her father was Count Frederick II of Diessen. He was Vogt of the Cathedral chapterinRegensburg. He was married three times; it is unclear in which marriage Haziga was born.
Her first husband was Count Herman of Kastl (d. 27 January 1056). With him, she probably had two sons and a daughter:
Herman, Count of Cham (d. after 1071)
Frederick I, Count of Kastl and Habsburg (d. 10 November 1103)
Matilda, married Count Rapoto III of Upper Traungau (d. 15 October 1080)
Her second husband was Count Otto I of Scheyern (d. 4 December 1078). It was also his second marriage. He had four children; it is possible some or all of these were from his first marriage:
Hans Constantin Faußner: Zur Frühzeit der Babenberger in Bayern und Herkunft der Wittelsbacher, Jan Thorbecke Verlag, Stuttgart, 1990, ISBN3-7995-2413-4
