MERTHER, a parish in the western division of the hundred of POWDER, county of CORNWALL, 5 miles (W.) from Tregony, containing 370 inhabitants. The living is a perpetual curacy, with the vicarage of St. Probus, in the archdeaconry of Cornwall, and diocese of Exeter, endowed with £600 royal bounty. The church is, dedicated to St. Merther. Here is a place of worship for Wesleyan Methodists. At Tresilian bridge, in this parish, the treaty between Sir Ralph Hopton and Sir Thomas Fairfax was concluded, in March 1646, by which this county was surrendered to the parliament; There are fairs at Tresilian bridge, on the second Monday in February, and on the Monday before Whit- Sunray, for cattle. St. Clement's creek, an inlet of the river Mopus, between Falmouth and Truro, is navigable here. Mr. William Hals, author of the Parochial History of Cornwall, resided at Tresawson in this parish.