Hasculf de Tany (sometimes Harscoit or de Tani; died about 1140) was an Anglo-Norman nobleman who lived in medieval England, in the region of London. He is believed to have been castellan of the Tower of London. Background and marriage Based upon his name, and that of his son Graelen, Hasculf's family may have had ancestry in Brittany. However they came to England from Tanis, in the Avranchin in Normandy, close to Mont Saint-Michel and the frontier with Brittany. It has been proposed that he was a close relative, perhaps even son, of Otuel fitzCount, whose father Hugh d'Avranches was viscount of that region, and that they were both related to the Suligny family, who were also from there. He had contemporaries in England with the same second name who were probably related, named Picot de Tanis, and Juliana de Tanis. Hasculf also appears to have had a second son, Gilbert de Tanis, who was father to a younger Graelen in subsequent generations. Hasculf married Matilda (or Maud), whose parentage is the subject of different speculations, and she was the mother of Hasculf's son and heir Graelen. Charles Travis Clay demonstrated that Matilda was almost certainly also the mother, apparently from an earlier husband, of Edward of Salisbury the younger who was noted to be the elder brother of Graelen de Tanys in a 1202 legal case concerning claims by Edward's descendants to be heirs to lands in the barony of Crich. On this basis Clay believed she was a co-heiress of Ralph fitz Hubert, the lord of the feudal barony of Crich in the Domesday Book of 1086. Because of his name her son Edward is often believed to be a son of the older man of the same name. After his death, Hasculf de Tany's wife Matilda and son Graelan gave the church of Fyfield in Essex to Bermondsey Priory, and also confirmed the gift of Roger the knight of John fitzWaleran who had given the tithes of Fyfield to that monastery. Based on these acts, Katharine Keats-Rohan has written that Matilda was the daughter of Roger and her father's heiress for lands he had held of John fitzWaleran in Essex. However, when Keats-Rohan separately considered the same Matilda as mother of Edward of Salibury the younger, she accepted the proposal of Clay. In contrast to Keats-Rohan, but based upon the same grant, I.J. Sanders thought Matilda was