see Poland Street 1 to 9 & 49 to 62 in London Addresses dataset
Thomas Rowlandson DNB 1757-1827 lived at 50 Poland St from or before 1787 with his aunt Jane Rowlandson who had brought him up and a servant Mary Chateauvert. His aunt Jane died there April 1789 (her will PCC 1789), he had moved to the Strand by Christmas 1791 / ratebooks 50 Poland St 1789 Thomas Rawlinson / SunFire 1790 Thomas Rowlandson gent 50 Poland St
DNB says his companion and executrix Betsey Winter died in 1835 and that there is a drawing reputedly of her by him from the late 1780s. If she was the…