In 1791 two Catholic lawyers set up in business as Barrett and Eyston in Fig Court, one of the capital's lost inns. The Eyston family claimed collateral descent from Thomas More, a lawyer and a saint. In its early days the company allied itself closely with the movement for Catholic emancipation and the members of the Cisalpine club, launched to further the cause of the Church in England by playing down the authority of Rome. The association with the Witham family, some of whom were barristers since the early eighteenth century, came only in the 1830s. By 1900 the firm was operating as Witham, Roskell, Munster and Weld — a collection of names that not surprisingly gave way to the simpler Witham & Co in around 1935. But the Weld name reappeared when not long afterwards the company joined with another firm of Catholic solicitors based in Liverpool, run by the same family. It has been Witham and Weld ever since. In 2006, the firm of Pothecary Witham Weld was created following the merger of Pothecary & Barratt and Witham Weld.
Traditionally Witham Weld's Clients have been the Catholic church, its dioceses and clergy, and top people from the country's Catholic gentry and aristocratic stock.