LLANGWILLOG (LLAN-GWILLOG), a parish, partly in the hundred of LLYVON, partly in the hundred of MENAI, and partly in the
hundred of MALLTRAETH, union of ANGLESEY and county of ANGLESEY, NORTH WALES, 3 miles (N. W.) from Llangevni; containing
260 inhabitants. This parish, which derives its name from the dedication of its church to St. Cwyllog, a female saint, who
flourished in the middle of the sixth century, is pleasantly situated nearly in the centre of the island, and on the
turnpike-road leading from Llangevni to Llanerchymedd, from which places it is equidistant. A sanguinely battle is said to
have taken place on Macs Rhos Rhyvel, in 1143, between the forces of Owain Gwynedd, Prince of North Wales, and the united
armies of the Erse, Manks, and Norwegians, who had invaded the island, in which the Welsh prince was triumphantly
victorious. Upon that occasion the whole naval force of Wales is said to have been brought into action, and to have
succeeded in capturing all the ships of the enemy of Dulas bay. This victory is celebrated in Gray's Ode to the memory of
Owain Gwynedd, in which he eulogizes the exploits of that chieftain; but it is not noticed by any of the principal Welsh
historians. The parish is bounded on the north by that of Coed-anna, on the south by Heneglwys, on the east by Tregayan,
and on the west by Bodwrog; and comprises by computation about 1600 acres, which are nearly all arable, and in general
inclosed and well cultivated, the surface being level and the soil light, thereby rendering the most important facilities
for tillage and the production of grain: there are two gentlemen's seats called Trescawen, and Bryngoleu. The living is a
perpetual curacy, endowed with £400 private benefaction, £600 royal bounty, and £800 parliamentary grant; net income, £90;
patron and impropriator, Sir R. B. Williams Bulkeley, Bart. The church, situated in that part of the parish which is in
the hundred of Malltraeth, was originally founded in the year 605: the present edifice, which is remarkably well built,
measures 38 feet by 18, and has an ancient and curious chapel at the west end of the nave, it contains sittings for 80
persons, one-sixth of which are free. There are places of worship for Calvinistic and Wesleyan Methodists, the former of
whom support a Sunday school, in which are about 70 males and females. The only charitable benefaction in the parish is a
rent-charge of 15s. bequeathed by John Griffith Lewis, and paid by Mrs. Prichard of Trescawen; but other gifts, including
one of £10 by William Prichard, have been lost, owing to the insolvency of parties to whom they were lent. At a short
distance from Maes Rhos Rhyvel is a place called a Castel'," the origin and history of which are equally unknown. Coins of
Nero, Vespasian, and Constantine, have been found at various times, in a state of good preservation, and in 18'29 a gold
coin of Vespasian was dug up, the impression on which was quite perfect.