Question: When did the king that Walter D'Aincourt was a landholder under die?
Context: Walter William Law (November 13, 1837 – January 17, 1924) was a businessman and the founder of the 8,000-person village of Briarcliff Manor, New York.  He was a vice president of furniture and carpet retailer W. & J. Sloane, and later founded the Briarcliff Lodge, the Briarcliff Table Water Company, Briarcliff Farms, and the Briarcliff Greenhouses.  He founded or assisted in establishing several schools, churches, and parks in the village, and rebuilt its train station in 1906.  In the early 1900s, Walter Law was the largest individual landholder in Westchester County. Sir Walter Paveley KG (1319–1375) was an English knight from Kent, a Knight Founder of the Order of the Garter.  He was the son of Sir Walter Paveley (d. 1327), a Kentish landholder, and Maud (1304 – c. 1366), daughter and heir of Sir Stephen Burghersh (d. 1310), the elder son of Robert Burghersh (d. 1306). Josce de Dinan (died 1166) was an Anglo-Norman nobleman who lived during and after the civil war between King Stephen of England and his cousin Matilda over the throne of England.  He was a landholder in the Welsh Marches when he was married by Stephen to the widow of Pain fitzJohn, a union that gave Josce control of Ludlow Castle.  Control of the castle was contested by other noblemen, and the resulting warfare between the nobles forms the background to a late medieval romance known as "Fouke le Fitz Waryn", which is mainly concerned with the actions of Josce's grandson, but also includes some material on Josce's lifetime.  Josce eventually lost control of Ludlow and was granted lands in compensation by Matilda and her son, King Henry II of England, who succeeded Stephen in 1154. William Brewer, 1st Baron Brewer ("alias" Briwere, Brigwer, etc.) (died 1226) of Tor Brewer in Devon, was a prominent administrator and judge in England during the reigns of kings Richard I, his brother King John, and John's son Henry III.  He was a major landholder and the founder of several religious institutions.  In 1204, he acquired the feudal barony of Horsley in Derbyshire. Rhys ap Thomas (1449–1525), KG, was a Welsh soldier and landholder who rose to prominence during the Wars of the Roses, and was instrumental in the victory of Henry Tudor at the Battle of Bosworth.  He remained a faithful supporter of Henry and was rewarded with lands and offices in South Wales.  Some sources claim that he personally delivered the death blow to King Richard III at Bosworth with his poleaxe. Walter I Beke (fl.12th.c) ("alias" Bech, Bek, Beche, Beke, Beek, Bec, etc.  Latinized to de Becco) of Eresby in the parish of Spilsby in Lincolnshire was a prominent Anglo-Flemish landholder. Richard Walter John Montagu Douglas Scott, 10th Duke of Buccleuch and 12th Duke of Queensberry, (born 14 February 1954), styled as Lord Eskdaill until 1973 and as Earl of Dalkeith from 1973 until 2007, is a Scottish landholder and peer.  He is the Duke of Buccleuch and Queensberry, as well as Chief of Clan Scott.  He is the senior patrilineal descendant of James, Duke of Monmouth (9 April 1649 – 15 July 1685), the eldest illegitimate son of King Charles II and his mistress, Lucy Walter.  Through Charles, he is a direct descendant of Mary, Queen of Scots. Walter D'Aincourt (or Walter Deincourt or d'Eyncourt) was a landholder in Derby under King Edward the Confessor in 1065/1066. Anna Karlsdotter (Vinstorpa) (died 1552), was a Swedish noble and landholder.  By her daughter Ebba Eriksdotter Vasa, she was the maternal grandmother of queen Margaret Leijonhufvud and thereby great grandmother of king John III of Sweden and king Charles IX of Sweden.  She is remembered as one of several possible people later identified with the famous legend of Pintorpafrun. Edward the Confessor (Old English: "Ēadƿeard Andettere" ] , Latin: "Eduardus Confessor" ] ; c. 1003 – 5 January 1066), also known as Saint Edward the Confessor, was among the last Anglo-Saxon kings of England.  Usually considered the last king of the House of Wessex, he ruled from 1042 to 1066.
Answer: 5 January 1066