There does not appear to be any mention of Everleigh in Domesday Book, but extracts from the "Magna Brittanica" published between 1806 and 1822 and quoted by Hoare in his "Modern Wiltshire" show that in the early years of the fourteenth century (about 1310), the lordship belonged to Henry Plantaganet, Earl of Lancaster. He was a great grandson of Edmund Plantaganet, Earl of Lancaster, a younger son of Henry III.

Dying without male heirs, his vast estates passed to his daughters Maud, and Blanche, the former inheriting Everleigh. Maud married William, Duke 0f Bavaria, and dying without children, in 1362 she bequeathed Everleigh to Blanche who had married John-o'-Gaunt, third son of Edward III, then Earl of Richmond. John-o'-Gaunt, by right of his wife, was made Duke of Lancaster, and his son Henry Bolingbroke, who became King (Henry IV) in 1399 inherited all.

 

Presumably the manor then remained in Royal hands until 1547, for in that year when the boy King, Edward VI, ascended the throne, "the manor, park, and freewarren of Everleigh" late part of the Duchy of Lancaster, was granted to Edward, Duke of Somerset, Lord Protector, on whose attainder in 1552 it reverted to the Crown.

 

According to local tradition it was afterwards (about 1560) granted by Queen Elizabeth I to Sir Ralph Sadler or Sadlier.