, remains of precinct wall north of Inner Gatehouse Early in 1121 Miles married
Sibyl de Neufmarché, daughter and heiress of
Bernard de Neufmarché, the conqueror of
Brycheiniog, which brought him her father's possessions (such as the new
Lordship of Brecknock). having died in or around 1126. Miles was (from 1128 at least) sheriff of Gloucestershire, a justice itinerant, and a justice of the forest, and by 1130 was
sheriff of Staffordshire. He had also (though the fact has been doubted) been granted his father's office of constable by a special charter. In conjunction with
Pain fitzJohn, sheriff of Herefordshire and Shropshire, he ruled the whole Welsh border "from the Severn to the sea". On his accession, King
Stephen set himself to secure the allegiance of these two lords-marchers, who at length, on receiving a safe conduct and obtaining all they asked for, did him homage. Miles is next found attending the Easter court at Westminster as one of the royal constables, and, shortly after, the Oxford council in the same capacity. He was then despatched to the aid of the widow of
Richard fitz Gilbert de Clare, who was beleaguered in her castle by the Welsh and whom he rescued. Meanwhile, Miles had married his son and heir, Roger, to Cecily, daughter of fitzJohn, who inherited the bulk of her father's possessions. In the same year 1136 Miles transferred the original house of Augustinian canons at
Llanthony Priory, Monmouthshire to a site on the south side of Gloucester, which they named
Llanthony Secunda. Two years later (1138) Miles received, in his official capacity, Stephen at Gloucester in May. He has been said to have renounced his allegiance a few weeks later, but he was with Stephen in August (1138) at the siege of Shrewsbury, and his defection did not take place till 1139. In February 1139 Stephen gave
Gloucester Abbey to Miles's kinsman
Gilbert Foliot at his request. In the summer of 1139, however, he joined his lord,
Robert, Earl of Gloucester, in inviting
Empress Matilda to England. On her arrival Miles met her at Bristol, welcomed her to Gloucester, recognised her as his rightful sovereign, and became thenceforth her ardent supporter. She at once gave him
St. Briavels Castle and the
Forest of Dean. Miles's first achievement on behalf of Matilda was to relieve
Brian Fitz Count who was blockaded in
Wallingford Castle. In November (1139) he again advanced from Gloucester and attacked and burnt
Worcester. He also captured the castles of
Winchcombe,
Cerne, and
Hereford. Meanwhile, he was deprived by Stephen of his office of constable. He took part in the
victory at Lincoln (2 February 1141), and on the consequent triumph of the empress, he accompanied her in her progress, and was one of her three chief followers on her entry (2 March) into Winchester. He was with her at Reading when she advanced on London, and on reaching
St. Albans Matilda bestowed on him a house at Westminster. He was among those who fled with her from London shortly after, and it was on his advice, when they reached Gloucester, that she ventured back to Oxford. There, on 25 July 1141, she bestowed on him the town and castle of Hereford and made him earl of that shire, as well as the forests of the
Hay of Hereford and Trinela in avowed consideration of his faithful service. With singular unanimity, hostile chroniclers testify to his devotion to her cause. As "Earl Miles", he now accompanied her to Winchester, and on the
rout of her forces on 14 September 1141 he escaped to Gloucester, where he arrived "exhausted, alone, and with scarcely a rag to his back". Towards the end of the year he was in Bristol making a grant to Llanthony Priory in the presence of the Empress Matilda and Robert, Earl of Gloucester. In 1142 he is proved by charters to have been with the Empress at Oxford and to have received her permission to hold
Abergavenny Castle of Brian Fitz Count. It is probably to the summer of this year that he made a formal deed of alliance with the Earl of Gloucester, and as a hostage, he gave the Earl his son Mahel. In 1143 Miles's pressing want of money to pay his troops led him to demand large sums from the church lands.
Robert de Bethune,
Bishop of Hereford, withstood his demands, and, on the Earl invading his lands, excommunicated him and his followers, and laid the diocese under interdict. The Earl's kinsman, Gilbert Foliot (
Abbot of Gloucester), appealed to the legate on his behalf against the bishop's severity. ==Death and burial==