Theophilus Gottlieb Siegfried Bayer (1694-1738), was a sinologist, and Professor of Greek and Roman Antiquities at St Petersburg Academy of Sciences, Russia, between 1726-1738 . His library was sold by his widow to Heinrich Walter Gerdes (d. 1741), a Lutheran pastor in London, England. It was subsequently purchased from Mrs Gerdes by William Hunter (1718-1783) the London-based anatomist and obstetrician, and incorporated into his collection of manuscripts and books.
From the guide to the Chinese and other oriental books, manuscripts, and papers of Theophilus Bayer, 1694-1738, sinologist, 1600-1738, (Glasgow University Library, Special Collections Department)