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Definition of the House of Lancaster from the Oxford Advanced Learner's Dictionary

 

the House of Lancaster

 
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the English royal house (= family) descended from John of Gaunt, Duke of Lancaster, which ruled England from 1399 to 1461. The three kings of the House of Lancaster were Henry IV, Henry V and Henry VI. During the rule of Henry VI, the Wars of the Roses began between the Lancastrians and the Yorkists, which resulted in the creation of a new royal house, the House of York(1461-85).