1173, when their eldest daughter Ida succeeded as countess. Following the death of Ida's daughter, Matilda II, the county of Boulogne eventually passed to Adelaide of Brabant, daughter of Marie's second daughter, Mathilde. Issue Ida, Countess of Boulogne (1160/1161 – 21 April 1216), married firstly Gerard of Guelders; secondly Berthold IV of Zahringen; and thirdly Count Renaud de Dammartin, by whom she had one daughter, Matilda II of Boulogne, who succeeded her as countess. Mathilde of Flanders (1170 – 16 October 1210), married in 1179 Henry I, Duke of Brabant References Sources Further reading S. P. Thompson (2004) Mary (Mary of Blois), suo jure countess of Boulogne (d. 1182), Online Oxford Dictionary of National Biography 1136 births 1182 deaths 12th-century French nuns 12th-century women rulers 12th-century English nuns French countesses English princesses Counts of Boulogne House of Blois House of Metz Children of Stephen, King of England Benedictine nuns Anglo-Normans Daughters of kings