Othon-Guillaume de Mâcon ¹

  General Notes:

Also known as Otto-William of Burgundy and Otto Vilhelm of Burgandy

Otto-William was duke of Burgundy between 1002 and 1004. Otto-William was son of Adalbert, deposed King of Italy, and step-son of Otto-Henry, the Great, who he succeeded in the duchy at a young age.

Determined to be sovereign ruler of his own lands, Otto-William revolted against Henry II, Holy Roman Emperor in 1016. Burgundy was annexed to the crown of France by king Robert II in 1004, and after this date, Otto-William was nominal count of Burgundy. Later Robert gave the duchy to his heir, future king Henry I of France.

He married Ermentrude of Reims, daughter of Count Renaud of Reims. Their children were:
- Agnes of Burgundy, married (1) William V of Aquitaine; (2) Geoffrey II of Anjou;
- Geberge of Burgundy, married Guilhem II of Provence;
- Matilda of Burgundy, married Landri of Nevers;
- Renaud I, Count of Burgundy.

Otto (Odo) Vilhelm was married a second time, before 1016, with Adelheid.
He was a Count of Mâcon from 981 to 986. He was a Count of Nevers. Acceded: Count of Burgundy, 985.

[source: Ketil Ken Nygaard's Genealogy, http://nygaard.howards.net/]

Othon-Guillaume married Ermentrude de Roucy about 982.¹ (Ermentrude de Roucy died after 1005 ¹.)