The English royal house that reigned from 1399 to 1461; its emblem was a red rose WordNet 3.0 & Open English WordNet

The House of Lancaster was a cadet branch of the royal House of Plantagenet. Wikipedia

A British royal dynasty Wikipedia Disambiguation

Noble family Wikidata

The House of Lancaster, a dynasty of English kings and one of the opposing factions involved in the 15th century Wars of the Roses. The name comes from the fact that its members were descended from John of Gaunt, 1st Duke of Lancaster; their symbol was a red rose. Wiktionary

The House of Lancaster. Wiktionary (translation)