Catherine of Lancaster (1372–1418) was a member of the English royal family, known for her marriage to Henry IV of England. She was the daughter of John of Gaunt, the Duke of Lancaster, and Blanche of Lancaster. Catherine played a significant role in the political landscape of her time, as her marriage helped to strengthen the ties between the Lancaster and York factions during the turbulent period of the Wars of the Roses. Catherine and Henry IV had several children, including Henry V, who would later become a notable king. Catherine's lineage contributed to the ongoing conflicts between the Lancaster and York houses, which ultimately shaped the course of English history. Her life reflects the complexities of royal alliances and the impact of familial connections in medieval England.