William Caslon

William Caslon I founded the Caslon Foundry in 1739, based on what previously had been Godfrey Head's (1685–1700). The other half of that business was purchased by John James, son of Thomas James. John James in the period 1716–1764 also built up by purchase what became the leading English type foundry of the 18th and early 19th centuries. He acquired moiety of half of Robert Mitchell and Jacob Ilive in 1740. A later and important purchase was the foundry of Thomas Grover in 1758. James ultimately combined under his own direction nine old English Foundries.

John James, William Caslon I and John Baskerville were left by consolidation as the only three representatives of the trade in the country. Caslon had two apprentices in his Foundry, Thomas Cottrell and Joseph Jackson. They started a foundry of their own in direct competition to their employer in 1757. In 1759 Jackson entered the Navy leaving Cottrell to carry on alone. Jackson left the navy in 1763 and continued to be employed in Thomas Cottrell, Neveil's court 1759–1785 Foundry for a short time. He commenced business in a separate Foundry with two fellow workman who helped to find the capital 1764 – 1792. When Jackson died in 1792 it was William Caslon I's grandson, William Caslon III who purchased the foundry in Salisbury Square.

Following the death of William Caslon I in 1766, his son William Caslon II took over the Caslon Foundry, running it with the assistance of his wife, Elizabeth née Cartlich, until his own death in 1778. Elizabeth Caslon then continued to manage it jointly with her two sons, William Caslon III (1754–1833) and Henry Caslon (c.1755–1788) trading as "Elizabeth Caslon and Sons". Henry died in 1788, and in 1792 William III sold his share of the business to his mother and his sister-in-law, Elizabeth née Rowe, Henry's widow: the two Elizabeth Caslons continued to run it until the elder Elizabeth's death in 1795. As a result of a legal dispute over the terms of her will, the Foundry was then thrown into Chancery and put up for auction in 1799. It was bought by the younger Elizabeth Caslon, who took into partnership a distant relative, Nathaniel Catherwood. Both partners died in 1809. The subsequent proprietors were: Henry Caslon II and F. F. Catherwood, 1809–1821; Henry Caslon II, H. W. Caslon and M. W. Livermore (trading as Caslon, Son and Livermore), 1821–1840; Caslon & Son, 1840–1850; H. W. Caslon and Co., 1850–1873. H. W. Caslon died in 1873, when the Foundry was acquired by T. W. Smith and partners. However, the Company name remained H. W. Caslon and Co. Ltd., and continued running until 1937, when it was acquired by Stephenson Blake.

Meanwhile, following his sale of his share in the original foundry in 1792, William Caslon III had purchased (in the same year) the Salisbury Square foundry from the estate of the recently deceased Joseph Jackson, and renamed it W. Caslon & Son. In 1807, W. Caslon & Son was passed to William Caslon IV. In 1819, William IV sold the business to the new Sheffield foundry of Blake, Garnett & Co. In 1837, the Salisbury Square Caslon Foundry became the property of Stephenson, Blake & Co.