| William I, Duke of Aquitaine | |
|---|---|
| Duke of Aquitaine | |
 | |
| Born | 22 March 875 |
| Died | 6 July 918 (aged 43) |
| Father | Bernard Plantapilosa |
William I (22 March 875 – 6 July 918), called the Pious, was the Count of Auvergne from 886 and Duke of Aquitaine from 893, succeeding the Poitevin ruler Ebalus Manser. He made numerous monastic foundations, most important among them the foundation of Cluny Abbey on 11 September 910.