The richest queen in history is Queen Elizabeth II of England. Her estimated net worth ranges from 500 million to 6 billion pounds, making her one of the richest women in the world. She owns extensive property, including Buckingham Palace, Windsor Castle, and the Crown Estate, which is a vast portfolio of land and properties worth billions of pounds. The queen also receives a sovereign grant, an annual payment from the government, to cover the costs of official royal duties and expenses.