William IX of Auvergne

He was the son of Robert IV of Auvergne and Mahaut of Burgundy.

The only source about him is Alberic of Trois-Fontaines's chronicle, which states that he was the count of Auvergne and the brother of Guy II of Auvergne and Robert of Auvergne.^[1]

Since his brother is first recorded as count in 1198,^{[citation needed]} it is assumed that he died or abdicated around that time.