William Ibbotson Horn (1808-1873) was born in London in 1808, the son of Joseph Horn and his wife, Mary Ibbotson (an alternate spelling was Ibbetson). Mary was the daughter of William Ibbotson, whose descendants managed Wm. & Geo. Ibbotson & Co, toolmakers. After the Ibbotson partners in this firm had died, it passed to William I. Horn. He manufactured (or marketed) saws, files, edge tools, scythes, and fenders at Bridge Street Works; and also operated as a tilter and roller at Wisewood Works. In 1864, the forge at Wisewood was swept away by the Sheffield Flood. Horn's claim for damages was assessed at £8,750. Horn apparently never advertised. But he accumulated enough money to become known as the 'opulent bachelor'. He died on 3 January 1873 at his residence Carrwood House, Grimesthorpe Road. He had taken no part in public affairs and his death received little attention in the press, until the appearance of the details of his estate (nearly £100,000, or about £10m at 2016 prices) and his gener­ous bequests (£17,500 to various charitable and Wesleyan institu­tions). He was buried in Burngreave cemetery, beneath a substantial monument. The steel and tool merchant J. & R. Dodge absorbed Horn's firm. The name and mark, 'W. I. HORN & CO', was later used by Tyzack, Sons & Turner (on strickles); by W. K. & C. Peace; and by cutlery maker Francis Newton & Sons.