Eustace IV, Count of Boulogne
| Eustace IV | |
|---|---|
Piece of coinage with Eustace IV's effigy | |
| Count of Boulogne | |
| Reign | 25 December 1146 – 17 August 1153 |
| Predecessors | Matilda I and Stephen |
| Successor | William I |
| Born | c. 1130 |
| 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 the County of Boulogne from 1146 until his death. He was the eldest son of King Stephen of England and Countess Matilda I of Boulogne. When his father seized the English throne on Henry I's death in 1135, he became heir apparent to the English throne but predeceased his father.