... de Boulogne , Biarritz . 6130 942 Princess Mary of Hanover , 1849 . Grandson . Son of King George V. , 1819-1878 ... Mecklenburg- Strelitz , 1822 . Adolphus Frederic , Hereditary Grandduke of Mecklenburg - Strelitz , 1848 . Neustrelitz . Duke ...