Cotentin where Néhou, the de Redvers principal possession, was located. Since de Redvers also owned land in the Vexin which was retained by Robert, he had two lords, and evidently chose to support the one under whom his main property lay. From 1090 when Henry fell out with both his older brothers, Richard de Redvers was unswerving in his support of Henry, so much so that he was mentioned by both Orderic Vitalis and William of Jumièges in their chronicles. Richard's manor at Mosterton does not appear in the Redvers family records after about 1090 and it may therefore have been forfeited due to his support of Henry against William Rufus. The manor passed to the Blount family which held it until the end of the 14th century. Under Henry I When William Rufus died suddenly in 1100 and Henry became king, Richard de Redvers quickly became one of his most trusted advisers. He witnessed more than 20 of Henry's charters and royal writs, in several different places, and sometimes as the only witness. After Richard's death his loyalty was remarked upon by Anselm of Canterbury. His continued allegiance resulted in Henry awarding him several large grants of land, most importantly the large Honour of Plympton (or feudal barony of Plympton) in Devon (part of which was the so-called Honour of Christchurch in Hampshire (now in Dorset), which was not technically a barony) and also the Lordship of the Isle of Wight with caput at Carisbrooke Castle. In addition to these he still held his estates in Normandy in the Cotentin (at Néhou) and Vexin (at Vernon) and he had also acquired the manors of Crowell in Oxfordshire and Woolley in Berkshire on his marriage. After the grants from the king, Richard's Devon estates probably consisted of around 180 Domesday manors, including Tiverton and Honiton, as well as the boroughs of Exeter and Plympton. The honour of Christchurch consisted of many widely scattered manors in several counties. He held virtually all of the Isle of Wight (the exceptions being two manors held by the bishop of Winchester), and the island remained in his family until 1293 when King Edward I bought it (together with other manors including Vauxhall, South Lambeth, in Surrey), from Isabel de Forz, 8th Countess of Devon (1237–1293), sister and heiress of Baldwin de Redvers, 7th Earl of Devon (1236–1262), shortly before her death. According to Robert