possibly the daughter of the Domesday baron John fitzWaleran, and perhaps Hasculf was the son of the knight Roger who held Fyfield from John fitzWaleran. Sanders, unlike Keats-Rohan, understood Hasculf and Matilda to have held John fitzWaleran's barony which had its caput at Aveley. Castellan in London In about 1115–1117, "Asciulus de Taneyo" was a witness together with Otuel fitzCount in a concord involving Gilbert, abbot of Westminster. A man named Aschuill and described as the successor of Otuel fitzCount as custodian of the tower, is believed to have been Hasculf de Tany. This would mean he became castellan of the Tower of London after the death of Otuel in 1120. In late 1136 or early 1137 this Aschuill was tried before King Stephen of England and the Lord Chancellor Roger le Poer, accused by the Holy Trinity Priory in London of confiscating land belonging to the priory. In the end, the priory regained custody of their land. In the 1129/30 Pipe Roll, Hasculf appears several times. He was pardoned from paying Danegeld in Essex and Middlesex. This record also indicates that before 1130 Hasculf was involved in a dispute with Rualon d'Avranches over some lands in Essex, which was resolved after a court case in which was levied a fine of 60 marks and a warhorse on Rualon. Also around 1130 Hasculf de Tany was a witness on London's first royal charter of liberties, granted by Henry I. After Hasculf's death, the castellany of the Tower went to Geoffrey de Mandeville, the 1st Earl of Essex, and was held to be hereditary. Death and legacy Hasculf was dead sometime between 1136/7, when he was involved in the legal case against Holy Trinity Priory, and 1141 when the empress Maud granted Geoffrey de Mandeville, the fief and serjeantry lands which Hasculf de Tani held in England on the day when he had died, which Graelan and his mother were then said to be holding. Graelan thus became a tenant lord under Mandeville holding seven and a half knights' fees, but by 1166 he once again held these lands directly from the king as a feudal baron. As noted by Stacy, the most recent editor of the 1166 baronial charters, the Tany barony, "with its caput at Aveley (Essex), comprised lands in Essex and Cambridgeshire" and its subordination under Mandeville by King Stephen and Empress Matilda "is unlikely to have survived