François Roudhloff (1781-1849) was a French luthier who trained with Breton at Mirecourt before opened his own workshop around 1811. He was known for his elegant acoustic guitars and lyre guitars but also made the usual violins and cellos. His brother Charles Roudhloff (1778 - 1859) was also a Mirecourt luthier. Charles' sons Dominique (born 1798) and Arnould (born 1804) Roudhloff, moved to London in the early 1830s and were based in 81 Charlotte Street in Fitzrovia where they made guitars under the D&A Roudhloff brand name and also traded as artists' colourmen until around 1857 when they presumably retired to France.

Source: Mirecourt luthiers - Roudhloff genealogy (2 April 2020)

Source: National Portrait Gallery - British artist suppliers 1650-1950 (2 April 2020)