Events
Date of Birth: about 1030 or 1040.
Place of Birth: unknown.
The estimated date is given by Donattini.
Date of Death: 8 November 1101.
Place of Death: Cyprus.
The date and place are given by Störmer. Schneidmüller (p. 12) gives 9 November 1101. Welf died on the return journey from a crusade to Jerusalem.
Relationships
Father: Alberto Azzo II, margrave of Milan.
This relationship is given by Reindel, by Donattini, and by Schneidmüller (p. 11).
Mother: Kunigunde of Altdorf.
This relationship is given by Riezler and by Schneidmüller (p. 11).
Spouse: an Italian.
This relationship is given by Störmer.
Spouse: Ethelinde of Northeim.
This relationship is given by Riezler and by Schneidmüller (p. 12).
Spouse: Judith of Flanders.
This relationship is given by Reindel and by Schneidmüller (p. 12).
Children (by Judith):
(Complete source citations for facts about the children on this page are currently outside of the scope of this project.)
Welf II (about 1073 - 24 September 1120), duke of Bavaria, married Matilda, countess of Tuscany.
Henry IX “the Black” (about 1074 - 13 December 1126), duke of Bavaria, married Wulfhilde of Saxony.
References
Donattini, M. Este genealogical table in volume 9 of Lexikon des Mittelalters. Munich: LexMA-Verlag, 1980-1998.
Reindel, Kurt. “Heinrich IX. der Schwarze” in Neue Deutsche Biographie 8 (1969) S. 343 [Onlinefassung].
Riezler. “Welf IV.” in Allgemeine Deutsche Biographie Band 41 (1896) S. 666-670).
Schneidmüller, Bernd. Die Welfen: Herrschaft und Erinnerung (819-1252) (Kohlhammer: Stuttgart, 2000).
Störmer, W. "Welf IV" in volume 8 of Lexikon des Mittelalters. Munich: LexMA-Verlag, 1980-1998.