Calstock is situate in the hundred of East, and hath upon the north Stoke Clemsland, west Kellaton, south St. Dominick, east the Tamar river.
The rectory of Calstock church seems to be extant before Domesday Tax, since it passed then by that name, and hath never admitted of any change of name or alteration since, and was undoubtedly founded and endowed by the Earls of Cornwall, out of their manor of Calstock, wherein it is situate; and the Duke of Cornwall, or the King, in that right, are still patrons thereof. Ecclesia de Calstock, in Decanatu de Estwellshire, was valued to the Pope's annats, 1294, cs.; in Wolsey's Inquisition and Valor Beneficionum, 26/. 4s. 4d> The pa- tronage as aforesaid, the Incumbent Blackburn, and the parish rated to the 4s. per pound Land Tax, 1696, temp. William III. 302l. 0s. 2d.
It appears from the ancient survey of the Duchy of Cornwall in the Exchequer, and Blount's Tenures from thence, p. 122, that the tenants of this manor had granted them, by the Earls or Dukes thereof, its lords, the liberty of free fishing on the Tamar river, in his verbis: "Nativi tenentes de Calstock, in comitatu Cornubiæ, reddunt per annum de certo redditu, vocato Berbiagium, sive barbague, ad le Hoke-day, 19s. 6d." Now barbague, barbagyu, is, in Cornish, a bearded or barbed spear, such as is commonly used for killing salmons in the Tamar and other rivers. [See Stoke-Clemsland.] The salmon wear, here built over the Tamar, is, by lease from the Duke of Cornwall, in possession of Sir John Carew, baronet, and hath formerly been set for 120l. per annum. [See Helston in Trigg for Barbiague. Tenants on the Alan river there.]