The Trewollas came from Cornwall England

Cornwall, a maritime county in the extreme south-west of England, bounded on the north-east by Devonshire, on all other sides by the sea. It is divided from Devonshire chiefly by the river Tamar, and washed along the north-west coast by the Bristol Channel, along the south-east coast by the English Channel. Its form is cornute or horn-shaped, extending south-westward from a base at the boundary with Devonshire to a point at Lands-End. Its breadth at the boundary with Devonshire is about 45 miles; its average breadth over the 17 miles next Lands-End is about 5 1/2 miles; its average breadth elsewhere is about 20 miles; its length from the middle of the boundary with Devonshire, along the centre to Lands-End is about 80 miles; its circuit, including sinuosities, is about 265 miles; and its area, which includes some near islets and the Scilly Islands, is 868,208 acres. A ridge of bare rugged hills, with one summit 1368 feet in height, and several others nearly as high, extends along all the centre; bleak moors lie among the hills and spread down from their sides; mounds of drifted sand, in some instances several hundred feet high, occupy considerable space along the north-west coast, and only very fertile valleys and bottoms, together with pieces of exceedingly romantic scenery, redeem the entire county from one general aspect of dreariness and desert. The chief rivers are the Tamar, the Lynher, the Looe, the Fowey, the Camel, and the Fal.

The soils are generally light, often largely mixed with gravel, yet show considerable variety, and range from sterility on the moors to fertility in the valleys, and they may be 'classified, into three kinds—the gritty and black, the shelvy and slaty, and the clayey and reddish. About 115,000 acres are waste, and the rest of the area is variously pasture, meadow, and arable land. Much moisture, both in frequent mists and frequent rains, characterises the climate; but this is favourable to agriculture, in consequence of the lightness of the soils, especially as few days pass without alternations of sunshine, and there is not a much greater aggregate of water throughout the year than in most other English counties. Agriculture has undergone great improvement, yet, being secondary here to mining, is not so improved as amongst most entirely agricultural populations