The investiture of Charles, Prince of Wales, took place in Caernarfon Castle, north Wales, on 1 July 1969. The ceremony formally presented the title of Prince of Wales to the 20-year-old Charles, eldest son of Queen Elizabeth II of the United Kingdom. He was the 21st heir to the English or British throne to hold the title. The investiture was a revival of a ceremony which had first been used for the previous prince of Wales, Edward, in 1911. The 1969 event was watched by 500 million people worldwide on television, but it received opposition in particular from Welsh nationalist organisations.