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 when the heir is in Scotland. The current Duke of Rothesay is Prince William, who became the titleholder following the accession of his father, King Charles III. The title reflects the historical connection between the British monarchy and Scotland, emphasizing the importance of Scottish heritage within the royal family.