The original brewery was probably established by the Bucknall family, who leased the site in the seventeenth century. The site's first associations with brewing can be traced back to 1666 when a Joseph Truman is recorded as joining William Bucknall's Brewhouse in Brick Lane. Part of the site was located on Black Eagle Street, hence the brewery's name. Truman appears to have acquired the lease of the brewery in 1679, upon the death of William Bucknell. Through the Truman family's efforts – not least those of Sir Benjamin Truman (who joined the firm in 1722) – the business expanded rapidly over the following 200 years. By 1748 the Black Eagle Brewery was the third largest brewery in London, and likely the world, with 40,000 barrels produced annually.