He married in 1104: 1) Lucienne de Rochefort - the marriage was annulled.
He married in 1115: 2) Adélaide de Maurienne (c.1100-1154)
Their children:
1) Philippe (1116 - October 13, 1131), king of France (1129-1131)
2) Louis VII (1120 - November 18, 1180), king of France
3) Henri (1121 - 1174), archbishop of Rheims
4) Hugues (c.1122 - ????)
5) Robert (c.1123 - October 11, 1188), count of Dreux
6) Constance (c.1124 - August 16, 1176), married Eustace IV, count of Boulogne
7) Philippe (1125 - 1161), bishop of Paris
8) Pierre (c.1126 - 1180), married Elisabeth, lady of Courtenay
Almost all of his 29 year reign was spent fighting either the "robber barons" who plagued Paris, or the English. Nonetheless, King Louis managed to reinforce his power considerably and endeared himself to the working classes of France.
He was succeeded on the throne by his son Louis VII.
References
Suger, Abbot of Saint Denis,. The Deeds of Louis the Fat. Translated with introduction and notes by Richard Cusimano and John Moorhead. Washington, DC : Catholic University of America Press,1992. (ISBN 0813207584)
Suger, Abbot of Saint Denis,. The Deeds of Louis the Fat (http://www.fordham.edu/halsall/basis/suger-louisthefat.html). Translated by Jean Dunbabin (this version is free, but has no annotations)
LouisVI, King of France, surnamed "the Fat", was the son of Philippe I of France and Bertha of Holland.
In 1098 Louis was made a knight, and about the same time was associated with his father in the government, which the growing infirmities of Philippe left more and more to his son, in spite of the opposition of Bertrada, the queen, whose criminal union with Philippe had brought the anathema of the church.
Étienne de Garlande, whom Louis raised from obscurity to be archdeacon of Notre Dame at Paris, chancellor and seneschal of France, was all-powerful with the king from 1108 to 1127.