I first encountered Marian Theodore Charlotte Heidenreich von Siebold back in 2018 when I was researching the birth of the future Queen Victoria, ahead of this year’s bicentenary. Madame Siebold was the skilled German obstetrician who by an extraordinary circumstance, assisted at the births in 1819 of both Princess Victoria and that of her future husband, Prince Albert of Saxe-Coburg-Gotha, a…