Wer heiratete John I, Count of Auxerre?

John I of Chalon-Auxerre (1243–1309) was a son of John, Count of Chalon and his second wife, Isabella van Courtenay - his brother was bishop Hugo III of Chalon. John I married Adelaide of Auxerre and they ruled jointly as Count of Auxerre. John was the father of William of Chalon.

Adelaide of Auxerre (1251–1290) was ruling Countess of Auxerre in 1262-1290.

She was a daughter of Eudes of Burgundy and Mathildis II of Bourbon. In 1262 she succeeded her mother as Countess of Auxerre. In 1268 she married John I of Chalon, Lord of Rochefort, son of John – they had one child, William (died 1304).