Renaud de Dammartin
| Renaud I, Count of Dammartin | |
|---|---|
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| Spouse(s) | Marie de Châtillon Ida, Countess of Boulogne |
| Issue | |
| Noble family | House of Dammartin |
| Father | Alberic III of Dammartin |
| Mother | Mathilde of Clermont |
| Born | c. 1165 |
| Died | 1227 (aged 61–62) |
Renaud de Dammartin (Reginald of Boulogne) (c. 1165 – 1227) was Count of Boulogne from 1190, Count of Dammartin from 1200 to 1214 and Count of Aumale from 1204 to 1214. He was son of Alberic II of Dammartin, and Mathilde of Clermont.
Brought up at the French court, he was a childhood friend of Philip Augustus. At his father's insistence he fought for the Plantagenets. Received back into Philip's favour, he married Marie de Châtillon, daughter of Guy II de Châtillon and Adèle of Dreux, a royal cousin.
On Philip's advice, he then set aside Marie, and forcibly married Ida, Countess of Boulogne. The County of Boulogne thereby became vassal to the French king, rather than the count of Flanders. While this marriage made Renaud a power, it also made enemies in the Dreux family and that of the count of Guînes, who had been betrothed to Ide.
In 1203, Renaud and his wife gave a merchant's charter to Boulogne. This was probably made for financial consideration. Philip made Renaud Count of Aumale the following year, but Renaud began to detach himself. Following the acquisition of Normandy in April 1204, King Philip granted Renaud the county of Mortain and the honor of Warenne which was centered on the fortresses of Mortemer and Bellencombre. Both Mortain and Warenne had been held by William I of Boulogne and it would appear that King Philip recognized the Boulogne claim to them.
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