Hayne in the parish of Stowford in Devon, is an historic manor, situated about 11 miles south-west of Okehampton. The surviving Manor House, a grade II* listed building known as Hayne House was rebuilt in about 1810 by Isaac Donnithorne (died 1848), who later adopted the surname Harris having married the heiress of Harris of Hayne.
The manor was the seat of the Hayne (originally de Hayne) family, which as was usual, had taken their surname from their seat. In the 16th century the family died out in the male line on the death of Walter Hayne, one of whose daughters and co-heiresses was Thomasine Hayne, whose share of her paternal inheritance was the manor of Hayne.
Thomasine Hayne, heiress of Hayne, married William Harris (died 1547) of Stone in the parish of Lifton, Devon, son and heir of John Harris (second son of John Harris of Radford in the parish of Plymstock in Devon) by his wife, the heiress of the Stone family of Stone in the parish of Lifton, Devon. The manor remained the seat of this junior branch of the Harris family.
John Harris (1507–1551) of Hayne, son and heir, Serjeant-at-Law to King Edward VI and Recorder of Exeter, who married Elizabeth Kelle, daughter of Nicholas Kelle of Radcliffe and Southwick in Devon. He purchased the manor of Lifton.
William Harris (1524-1590/1) of Hayne, son and heir, whose monument is in Lifton Church, married Mary Greville, a daughter of Sir Fulke Greville (died 1559) of Beauchamps Court in Warwickshire, by his wife Elizabeth Willoughby, 3rd Baroness Willoughby de Broke (died 1562), grand daughter and heiress of Robert Willoughby, 2nd Baron Willoughby de Broke, the wealthiest heiress of her time. Mary Greville's brother was Fulke Greville, 4th Baron Willoughby de Broke (1536–1606) of Beauchamps Court.
Arthur Harris (1561–1628) of Hayne and of Kenegie, Gulval, Cornwall, son and heir, Sheriff of Cornwall in 1603 and Captain of St Michael's Mount in Cornwall, married Margaret Davilles, daughter and sole heiress of John Davilles of Marland in the parish of Petrockstowe, Devon.