Prior and two monks, became in its turn (after 120 years) a cell dependent on the new Abbey of Tewkesbury. After a few years Giraldus, "having neither the inclination nor the ability to satiate the King's avarice (Henry I.) with gifts," was obliged to leave Tewkesbury and returned to Winchester, where he died in 1110.

Fitz-Hamon had died in 1107 from the effects of a wound received at the siege of Falaise, and was buried temporarily in the Chapter House, which stood on the south side of the building.

In 1123 the Abbey was complete, and was consecrated on November 20th, with much ceremony, by Theulf, Bishop of Worcester, assisted by the Bishops of Llandaff, Hereford, Dublin, and another whose name is unknown.

The main part of the church, as it now stands, is usually assigned to about 1123, and substantially is as strong now as it was then.

In the following year, 1124, Abbot Robert died, and soon afterwards Theulf, the old Bishop of Worcester, also passed away.

Of Fitz-Hamon's four daughters two became abbesses, another was married to the Earl of Brittany, and Mabel was given to Robert, one of the many illegitimate sons of Henry I. She seems to have been a business-like lady, and to have hesitated at the proposed union with a nameless lord, unless a title could be made to go with him. As Robert of Gloucester writes:

This Robert Fitzroy, thus made the first Earl of Gloucester, was a great benefactor to the Abbey. To him are due the completion of the church and the greater part of the tower. According to Leland, the stone was brought over from Caen, but some seems to have been local stone from Prestbury and Cheltenham. He was as prominent in the arts of peace as he was afterwards in those of war, inheriting his taste for the former from his scholarly father. It is to him that the chronicler William of Malmesbury dedicated his work.

Robert Fitzroy died in Gloucester in 1147, but was buried at St. James' Priory, Bristol, another foundation which was indebted to his munificence. His successor was William Fitzcount, the second Earl of Gloucester.

In 1178 the monastery was partly burnt down, the church fortunately suffering but little. There are some slight traces of fire on the exterior walls of the south and west faces of the tower, and on the interior of the south transept. The Annals of Winton say, "Combusta est et redacta in pulverem Ecclesia de Theokesberia"—an untenable hypothesis; but the Tewkesbury Chronicles merely mention that the monastery and the offices were destroyed. John, Earl of Cornwall, better known as King John, was entertained in the monastery soon afterwards, so that the damage cannot have been quite so overwhelming as the Winchester Chronicles allege it to have been. The fire might have been much more serious than it was, and it seems that only the fact of the wind being north-east saved the church. Judging by the marks of calcination on the outside of the tower, and the chief arch of the south transept, the roof must have been seriously damaged, and the roof of the cloister walk abutting on to the south aisle must have been completely burned. In all probability the group of roofing next to the south transept was destroyed.

William Fitzcount, dying in 1183, after a long and successful life, was buried at Keynsham, a magnificent abbey built by him in memory of a son who died young. Earl William's other children were girls, and the lordship of Gloucester was vested in Henry II. for some years. In 1189 the Abbey lands were granted by Richard I. to his brother John (who was afterwards king, 1199 to 1215), the first husband of Isabella, third daughter of William Fitzcount. Being divorced from John after his accession in 1199, she married Geoffrey de Mandeville, Earl of Essex, who paid 20,000 marks for the honour of Gloucester and the possessions of the Lady Isabel.

The earldom of Gloucester finally passed in 1221 to Amice—sister of the Lady Isabella—great granddaughter of Fitz-Hamon the founder, who had married Richard de Clare, Earl of Hertford. This Richard de Clare was the ancestor of the Tewkesbury De Clares, a family which held the honour of Tewkesbury for nearly a century.

His son, Gilbert de Clare, married Isabelle de Marechal. His name, as also that of his father, is among the signatories of Magna Charta, and he was a strenuous supporter of the barons against the King. Though he died in Brittany, his body was brought home and buried in Tewkesbury, at the foot of the steps leading up to the high altar. In a few months' time his widow, Isabelle, married Richard, Earl of Cornwall, brother of King Henry III. At her death she wished to be buried next to Gilbert de Clare, but as her husband objected to this, she bequeathed her heart to the Abbey, and this was duly interred in Gilbert de Clare's grave. As the Register quaintly says in its rhyming hexameters—

Gilbert de Clare bequeathed to the Abbey the manor called Mythe, on the hill just outside the town, and Isabelle also left to it many relics, besides vestments, and much valuable church furniture.

On the death of Gilbert de Clare, his son Richard became a ward of the King. Marrying Margaret de Burgh, a daughter of the great Earl of Kent, without permission, he incurred the royal displeasure, and was eventually forced to divorce his young wife in favour of the lady chosen for him. He supported the barons against the King, with whom he had never been in agreement. In 1262 he died, and was buried in the Abbey. One of his wife's sisters married Robert Bruce, competitor for the Scottish Crown and grandfather of King Robert Bruce.

His son Gilbert the second, Rufus or Rubens, i.e. Red, is another well-known figure. Like his father, he at first supported the barons, but soon after the battle of Lewes he took the King's side, and fought for him at Evesham. Again from pique he deserted him, returning to his allegiance once more in 1270. He was buried in the Abbey in 1295.

Gilbert de Clare the third, who was born at Tewkesbury in 1291, was perhaps the most famous of the De Clares. Whilst he was still in early manhood, he was twice chosen by Edward II. to serve as Regent of England in his absence, once even before he had attained full age. His promising career was cut short at Bannockburn in 1314, and the last of the De Clares was buried in the Choir in 1314, his widow being placed later by his side.

The lordship of Tewkesbury then passed from the De Clares, who had held it for ninety years, to Eleanor, Gilbert's eldest sister. By her marriage in 1321 to Hugh le Despenser, the lordship came into the hands of the Despensers. This Hugh the younger, or Hugo Secundus as the Register calls him, was too faithful a supporter of Edward II., and he paid for his fidelity with his life in 1326, having been hanged, drawn, and quartered in Hereford about three weeks after his aged father had suffered a