Henry of Lancaster was a prominent English nobleman in the 14th century, known for his role in the Hundred Years' War and his connection to the Plantagenet dynasty. He was born in 1345 and became the 1st Duke of Lancaster, a title that significantly increased his influence and wealth. As a member of the royal family, Henry played a crucial role in the politics of his time, supporting various kings and participating in military campaigns. His lineage continued through his descendants, notably influencing the Lancastrian branch of the English monarchy during the Wars of the Roses.