The term "Lancastrian" refers to anything related to the historical region of Lancashire in England, particularly during the period of the Lancaster dynasty. This dynasty was prominent in the 15th century and played a significant role in the Wars of the Roses, a series of civil wars for control of the English throne. In a broader context, "Lancastrian" can also describe the cultural, social, and political aspects associated with this region and its people. The term is often used in historical discussions, literature, and studies focusing on the House of Lancaster and its influence on English history.