In April 2016, the Principality received a letter from Queen Elizabeth II which communicated the Queen's good wishes on the anniversary of the founding of the Principality 46 years before, on 21 April 1970. The letter from Buckingham Palace was signed by Sonia Bonici, Senior Correspondence Officer. It reads in part: "I am to convey Her Majesty's good wishes to you and to all concerned for a most enjoyable and successful celebration on 23rd and 24th of April to mark the forty-sixth anniversary of the Principality of Hutt River." The Queen was replying to a letter from Prince Leonard congratulating her on her 90th birthday.