He already owned the Pentyrch blast furnace and several small forges when he became a partner in Dowlais Ironworks in 1759 .
Born into a landed family from Llanishen , Thomas Lewis became an iron - master .
Thomas Lewis already owned the Pentyrch blast furnace and several small forges when Thomas Lewis became a partner in Dowlais Ironworks in 1759 .
Born into a landed family from Llanishen , Thomas Lewis became an iron - master .