The Duke of Sussex is a title held by Prince Harry, the younger son of King Charles III and the late Princess Diana. He was born on September 15, 1984, and received the title upon his marriage to Meghan Markle in May 2018. The title is part of the British peerage and is associated with the historic county of Sussex in England. Prince Harry has served in the British Army and is known for his charitable work, particularly in mental health and veterans' support. In 2020, he and Meghan stepped back from royal duties and relocated to the United States, where they continue to engage in various philanthropic efforts.