The seat of the Right Hon. Viscount Dungannon, is situated about a mile from Chirk, and one of the most picturesque mansions in the Principality. The house was built during the reign of James I., from a design by Inigo Jones, and is situated on the brow of a hill, at the foot of which flows the Ceiriog. The park is fine, and is divided by the river. On the site of this house formerly stood the residence of Tudor Trevor, a British nobleman who lived A.D. 924, the head of the tribe of March or Maelor, and who bore the title of Earl of Hereford in right of his mother, the daughter and heiress of Lluddocca, ab Caradog Vreichvras, Earl of Hereford. Trevor had large possessions between the Wye and Severn, and was Lord of both Maelors, Chirk, Whittington, Oswestry, &c. His chief residence was Whittington Castle; he was contemporary of Hywel Dda, the Welsh law-giver; and Angharad, daughter of Hywel, became the chieftain’s wife, and had by him three sons and one daughter. The arms of this distinguished man, which are still borne by the Trevor family, are—“Parted per bend sinister ermine and ermines, over all a lion rampant, or.” Debrett informs us that “Arthur Hill, first Viscount, was only brother of Trevor, Viscount Hillsborough, ancestor of the Marquess of Downshire, and grandson of William Hill, who married secondly Mary, eldest daughter of Sir Marcus Trevor, Viscount Dungannon; so created, 1662, for his signal gallantry in wounding Oliver Cromwell at the Battle of Marston moor. Arthur, succeeding, 1762, to the estates of his maternal grandfather, Sir John Trevor, of Brynkinalt, Speaker of the House of Commons in England, and first Lord Commissioner of the Great Seal, assumed the name and arms of Trevor, and was created, April 27th, 1765, Viscount Dungannon.” An interesting fact connected with this noble family is, that the mother of the Duke of Wellington, the “Hero of a hundred fights,” was Anne, Countess of Mornington, daughter of Arthur Hill, the first Viscount Dungannon. This illustrious lady was closely allied with two greatly-distinguished men: her husband, the Earl of Mornington, ranked high as a musical composer, and “the Duke,” her son, placed himself high on the roll of fame with conquerors of ancient and modern renown. [Picture: Brynkinalt] The present Viscount Dungannon takes much interest in archæological pursuits, and is author of an ably-written work, in two volumes, 8vo., entitled “The Life and Times of William the Third, King of England, and Stadtholder of Holland.” His Lordship has acquired the literary distinctions of M.A., F.A.S., and M.R.S.L., and is an active magistrate for the district in which he resides. He has large possessions in the north of Ireland, in which he takes much interest. CHIRK CASTLE,