and prospered under the new regime, with the occasional point of tension with Henry. Stephen's daughter Marie I, Countess of Boulogne, also survived her father; she had been placed in a convent by Stephen, but after his death she left and married. Stephen's middle son, Baldwin, and second daughter, Matilda, had died before 1147 and were buried at Holy Trinity Priory, Aldgate. Stephen probably had three illegitimate sons, Gervase, Abbot of Westminster, Ralph and Americ, by his mistress Damette; Gervase became abbot in 1138, but after his father's death he was removed by Henry in 1157 and died shortly afterwards. Historiography Much of the modern history of Stephen's reign is based on accounts of chroniclers who lived in, or close to, the middle of the 12th century, forming a relatively rich account of the period. All of the main chronicler accounts carry significant regional biases in how they portray the disparate events. Several of the key chronicles were written in the south-west of England, including the Gesta Stephani, or "Acts of Stephen", and William of Malmesbury's Historia Novella, or "New History". In Normandy, Orderic Vitalis wrote his Ecclesiastical History, covering Stephen's reign until 1141, and Robert of Torigni wrote a later history of the rest of the period. Henry of Huntingdon, who lived in the east of England, produced the Historia Anglorum that provides a regional account of the reign. The Anglo-Saxon Chronicle was past its prime by the time of Stephen but is remembered for its striking account of conditions during "the Anarchy". Most of the chronicles carry some bias for or against Stephen, Robert of Gloucester or other key figures in the conflict. Those writing for the church after the events of Stephen's later reign, such as John of Salisbury for example, paint the King as a tyrant due to his argument with the Archbishop of Canterbury; by contrast, clerics in Durham regarded Stephen as a saviour, due to his contribution to the defeat of the Scots at the battle of the Standard. Later chronicles written during the reign of Henry II were generally more negative: Walter Map, for example, described Stephen as "a fine knight, but in other respects almost a fool". A number of charters were issued during Stephen's reign, often giving details of current events or daily routine, and these have become widely used as sources by modern historians. Historians in the "Whiggish" tradition that