From the Wikipedia page 
The House of Tudor was an English royal house of Welsh origin, descended in the male line from the Tudors of Penmynydd. Tudor monarchs ruled the Kingdom of England and its realms, including their ancestral Wales and the Lordship of Ireland (later the Kingdom of Ireland) from 1485 until 1603, with five monarchs in that period. The Tudors succeeded the House of Plantagenet as rulers of the Kingdom of England, and were succeeded by the House of Stuart. The first Tudor monarch, Henry VII, descended through his mother from a legitimised branch of the English royal House of Lancaster. The Tudor family rose to power in the wake of the Wars of the Roses, which left the House of Lancaster, to which the Tudors were aligned, extinct.