1779 in reference to the English royal family, from Welsh surname Tewdwr, used of the line of English sovereigns from Henry VII to Elizabeth I, descended from Owen Tudor, who married Catherine, widowed queen of Henry V. Applied from 1815 to a style of architecture prevalent during these reigns. The name is the Welsh form of Theodore.

Others are reading

Definitions of Tudor from WordNet
Tudor (n.)
an English dynasty descended from Henry Tudor; Tudor monarchs ruled from Henry VII to Elizabeth I (from 1485 to 1603);
Synonyms: House of Tudor
Tudor (n.)
United States dancer and choreographer (born in England) (1909-1987);
Synonyms: Antony Tudor
Tudor (n.)
a member of the dynasty that ruled England;
Tudor (adj.)
of or relating to a style of architecture in England in the 15th century;