Queen Mary (Princess Mary of Teck) is a descendant of Vlad III, Prince of Wallachia
Here is the line from Vlad II Dracul,who was the father of Vlad Dracula,or Vlad the Impaler:
Vlad II Dracul,"Vlad the Dragon",Duke of Wallachia,ruled from 1430-1446
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Vlad IV ''the Monk",Duke of Wallachia,lived from 1435-1495
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Radu IV "the Great",Duke of Wallachia,lived from 1467-1508
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Mircea III "the Shepherd",Duke of Wallachia,died in 1559
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Princess Stanca Basarab of Wallachia
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Semphira Logofat de Szaszebes,died in 1602
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Adam Racz de Galgo
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Peter Racz de Galgo
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Christina Racz de Galgo
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Katalin Kuun de Osdola
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Agnes Kendeffy de Malomviz,born in 1727
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Baron Gregor Inczédy de Nagy-Varad,died in 1816
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Baroness Agnes Inczedy de Nagy Varad,lived from 1788-1856
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Countess Claudine Rhedey de Kis-Rhede,lived from 1812-1841
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Duke Franz von Teck,lived from 1837-1900
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Princess Victoria Mary of Teck,lived from 1867-1953
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King George VI of Great Britain,lived from 1895-1952
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Elizabeth II,Queen of Great Britain,born in 1926
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Charles,Prince of Wales,born in 1948
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Prince William,the Duke of Cambridge,born in 1982
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Prince "Name" of Cambridge,born in 2013