The Duke of Rothesay is a title traditionally held by the heir apparent to the Scottish throne. It is one of the oldest titles in Scotland, dating back to the 15th century. The title is often associated with the Scottish royal family and is used primarily in Scotland, while the heir also holds the title of Prince of Wales in England. Currently, the title is held by William, Prince of Wales, who is the eldest son of King Charles III. As Duke of Rothesay, he participates in various ceremonial duties and represents the royal family in Scotland, helping to promote Scottish culture and heritage.