| Eustace IV | |
|---|---|
| Count of Boulogne | |
| Reign | 25 December 1146 –17 August 1153[1] |
| Predecessors | Matilda I andStephen |
| Successor | William I |
| Born | c. 1130[1] |
| Died | 17 August 1153 (aged c. 23) Bury St Edmunds,Suffolk |
| Burial | |
| Spouse | |
| House | Blois |
| Father | Stephen, King of England |
| Mother | Matilda I, Countess of Boulogne |
Eustace IV (c. 1129/1131 –17 August 1153) ruled theCounty of Boulogne from 1146 until his death. He was the eldest son of KingStephen of England and CountessMatilda I of Boulogne.[2] When his father seized the English throne onHenry I's death in 1135, he becameheir apparent to the English throne but predeceased his father.