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Chronicle' adds, they were driven back, with great slaughter, by the sons of Howel. Taking advantage of this domestic strife, the Danes, who were at this time established in Ireland and the Isle of Man, made frequent raids upon the coast. Towyn was laid waste by them in 963, and the sons of Herald, Marc and Gotbric (Gotffrid), harried Anglesea,and in 970 brought the whole of the island into subjection (Brut y Tywysogion, sub 970; William of Malmesbury). About 967 the English laid waste the lands of the sons of Idwal (Annales Cambriæ; Brut y Tywysogion), probably because Iago refused to pay the usual tribute to Edgar. Finally, it is said that the payment was commuted for a tribute of three hundred wolves' heads annually, but that this was paid only for three years, because in the fourth year there were no more wolves to be found (Brut y Saeson, in Rhys and Evan's Bruts, p. 390; William of Malmesbury, lib. ii. c. 8). In 967 Iago seized Ieuav, deprived him of his sight, and (according to Brut y Tywysogion) hanged Him. In 972 Edgar, after being crowned at Bath, proceeded to Chester, where (according to the meagre account of the Anglo-Saxon Chronicle) six underkings swore allegiance to him. Florence of Worcester (sub anno 973) and William of Malmesbury (i. 164) mention eight kings by name, among them Iago or Jacob, and they relate how Edgar was rowed down the Dee by them, while he himself steered (see also Brut y Saeson; Hoveden, s. a.) Iago's name also appears as Jacob, with the names of the other seven kings, as a witness to a very suspicious charter of Canterbury, dated at Bath at Whitsuntide 966 (Kemble, Cod. Dipl. No. 519).

Iago's brother, Ieuav, had left behind him a son, Howel, who watched his opportunity to avenge his father's wrongs. About the time of Edgar's visit to Chester, Howel succeeded, with Edgar's support, it is stated (Brut y Tywysogion, p.262), in seizing Iago's throne. Iago probably fled to Lleyn, where Howel and his English allies made a raid about 979. The following year Iago was captured by the Danes, who sailed in a fleet to Chester, and laid the city waste. Howel ab Ieuav thus acquired the complete sovereignty of Gwynedd, and Iago is not heard of again.

[Anglo-Saxon Chron.; Annales Cambriæ (both in Rolls Ser.); Brut y Tywysogion and Brut y Saeson in Rhys and Evans's Bruts; Gwentian Chron., ed by Owen; Florence of Worcester; William of Malmesbury; Gesta Regum.]

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IAGO ab Idwal ab Meirig (d. 1039) king of Gwynedd, was, probably on account of his tender years, thrust aside from the succession on the death of his father, Idwal ab Meirig [q.v.], in 997. The usual struggle between rival claimants ensued, and among others, Llewelyn ab Seissyllt, who was not a member of the royal house, filled the throne for a period; but on his death, in 1023, Iago seized the sovereignty of Gwynedd, while that of Dyved fell to the hands of Rhydderch ab lestyn (Brut y Tywysogion, p.265). Iago gave refuge to Iestyn ab Gwrgant, who had violated Ardden, the daughter of Robert ab Seissyllt, and cousin of Gruflydd ab Llewelyn ab Seissyllt. The latter thereupon attacked Iago and killed him after an obstinate battle in 1039. (Annales Cambriæ; Brut y Tywysogion; Gwentian Chron.} Gruflydd then placed himself on the throne occupied at an earlier date by his father, Llewelyn ab Seissyllt.

[See authorities cited.]

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I'ANSON, EDWARD (1812–1888), architect, born in St. Laurence Pountney Hill, London, 25 July 1812, was eldest son of Edward I'Anson (1775-1853), surveyor and architect in London. I'Anson was educated partly at the Merchant Taylors' School, and partly at the College of Henri IV in France, and was articled at an early age to his father. Subsequently he entered the office of John Wallen, principal quantity surveyor at that time in the city. At the close of his indentures I'Anson travelled for two years, extending his tour as far as Constantinople. On his return in 1837 he entered into practice, both as assistant to his father and as an independent architect. His first important building in the City was the Royal Exchange Buildings, designed for Sir Francis Graham Moon. This brought him into repute, and obtained for him the chief practice as architect in the city. I'Anson designed the greater part of the fine buildings in the city built exclusively for offices. Those executed by him in the Italian style, like the buildings of the British and Foreign Bible Society, were the most successful. Among his designs in the Gothic style may be noted the school of the Merchant Taylors' Company at the Charterhouse. I'Anson was surveyor to this company for many years, and also to St. Bartholomew's Hospital, for which he designed the new museum and library. Among his private commissions may be noted Fetcham Park, Leatherhead, and among ecclesiastical works the restorations of the Dutch Church in Austin Friars and of St. Mary Abchurch. I'Anson was elected a fellow of the Royal Institute of British Architects in 1840, and was chosen president in 1886. He contributed numerous papers to the 'Transactions' of the institute.