a town of Ireland, in the county of Down and province of Ulster, 8c miles from Dublin; otherwise written Killyleagh. It is the principal town in the barony of Duffrin; and seated on an arm of the lake of Strangford, from which it is supplied with a great variety of fish. The family of the Hamiltons created first Lords Clanbois, and afterwards earls of Clanbrassil, had their seat and residence here in a castle standing at the upper end of the great street; at the lower end of the street is a little safe bay, where ships lie sheltered from all winds; in the town are some good houses, a decent market-house, a horse barracks, and a Presbyterian meeting-house. On an eminence a small distance from the town is a handsome church built in the form of a cross. This place suffered much in the calamitous year 1641. It is now thriving, and the linen manufacture carried on in it, and fine thread made, for which it has a great demand. It formerly returned two members to parliament. The celebrated naturalist and eminent physician Sir Hans Sloane was born here 16th April 1660, and his father Alexander Sloane was at the head of that colony of Scots which King James I. settled in the place. This town was incorporated by that king at the instance of the first earl of Clanbois.