I first met with this name in Cornwall. Edward I. granted lands at Helston “by the tenure of grand sergeantry to William de Treville, on condition of his bringing a fish hook or iron crook and a boat and net, at his own proper costs and charges, for the King’s fishing in the lake of Helston (Loo Pool), “Lo Poole,” says Leland, “is two miles in length, and betwixt it and the main se is but a Barre of Sande; and ons in three or four Yeares, what by the Wait of the fresch water and rage of the se, it brackith out, and then the fresche and salt water meting makith a wonderful noise; but soon after the mouth is barred againe with sand.” whenever the King should come to Helston, and as long as he should tarry there. From this I conclude that this William de Treville either had been or was Keeper of the royalty of this lake or pool by inheritance and held one Cornish acre of land, that is to say, one hundred and eighty English acres, in Eglesderry by the tenure of Serjeancy for that purpose.” - Gilbert's Cornwall. The Trevilles were seated at Ethy or Tethe in the parish of St. Winnow. They continued for about four hundred years longer, and bore Or, a cross engrailed Sable; in the first quarter a mullet Gules. The last was John de Treville, Sheriff of Cornwall 18 Charles II., who left three daughters, his co-heiresses, married into the families of Burthog, Savery, and Arscott. - Lysons.

Richard de Trevill occurs in Bucks 1194-98 (Rotul. Curiæ Regis). Saier de Trivilla witnesses Robert de Stuteville’s grant to Wendling Abbey, Norfolk (Mon. Angl.). “The family of Treville possessed Rosemaund, Herefordshire. Of these, Alexander Treville (younger brother and heir of Baldwin, heir of Richard, heir of Baldwin), is stated to have had ‘fayre lands in the counties of Hereford and Norfolk’ temp. Edward I. This Alexander was summoned to parliament 1 Edward III., and died soon after. Baldwin, his son and heir, also died 17 Ed. III.; and his son Baldwin, then twenty-six years of age, doing his homage, had livery of his lands in this and seven other counties. He died 11 Richard II., leaving issue Baldwin, who dying 2 Henry IV., also left issue Baldwin, who died in his minority, 6 Henry IV., leaving three sisters his co-heirs, of whom Margaret married Sir Hugh Willoughby.” - Duncomb's Hereford.

Treville St., Plymouth (mentioned in the Corporation books of 1494-5 as “Trevyllys-strete”), commemorates an old merchant family long resident there, of whom the nearest surviving representative is believed to be Sir John Trelawny. Their coat-of-arms, a cross engrailed, over all a bendlet, proves that they belonged to the Cornish family.