Louis I, Count of Nevers
Louis I was suo jure Count of Nevers and jure uxoris Count of Rethel.
Louis was a son of Robert III, [Count of Flanders], and Yolande, Countess of Nevers. He succeeded his parents as Count of Nevers. In December 1290, he married Joan, Countess of Rethel, and thus became her co-ruler in the County of Rethel. They had two children:
- Joan of [Flanders, Countess of Montfort|Joanna of Flanders]
- Louis I, Count of Flanders, Nevers and Rethel