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Probably the same Thomas Lewis who was MP for Monmouth, Newport and Usk between 1713 and 1752
Thomas Lewis (1699-1764) was one of the founders of the Dowlais Ironworks, one of the largest ironworks in Wales.
Born into a landed family from Llanishen, Thomas Lewis became an iron-master. He already owned the Pentyrch blast furnace and several small forges when he became a partner in Dowlais Ironworks in 1759. He was the partner who arranged the mineral leases and construction of the new ironworks: the works were carried out by his business, Thomas Lewis and Co. He headed the business and his family interest was not bought out until 1848.
He was also a partner in the firm of Coles, Lewis and Co which had interests at Melin-y-cwrt and Ynys-y-gerwn.
Lewis's family had lived at Llanishen for many generations but he was responsible for building the New House there. He served as High Sheriff of Glamorgan in 1757.
He died in 1764