William V, Duke of Aquitaine
| William V | |
|---|---|
| Duke of Aquitaine | |
| Reign | 990 − 31 January 1030 |
| Predecessor | William IV, Duke of Aquitaine |
| Successor | William VI, Duke of Aquitaine |
| Born | 969 Poitiers |
| Died | 31 January 1030 Maillezais Cathedral |
| Burial | Maillezais Cathedral |
| Spouse | Adalemode of Limoges Brisque of Gascony Agnes of Burgundy |
| Issue | William VI, Duke of Aquitaine Odo of Gascony William VII, Duke of Aquitaine William VIII, Duke of Aquitaine Agnes of Poitou |
| House | Ramnulfids |
| Father | William IV, Duke of Aquitaine |
| Mother | Emma of Blois |
William the Great (French: Guillaume le Grand; 969 – 31 January 1030) was duke of Aquitaine (as William V) and count of Poitou (as William II or III) from 990 until his death. Upon the death of the emperor Henry II, he was offered the kingdom of Italy but declined to contest the title against Conrad II.