Where was the largest gathering of European royalty ever to take place?

The funeral of King Edward VII of the United Kingdom of Great Britain and Ireland. and Emperor of India occurred on Friday, 20 May 1910. The funeral was the largest gathering of European royalty ever to take place, with representatives of 70 states, and the last before many royal families were deposed in World War I and its aftermath.

King Edward VII had died on 6 May, and the funeral was held two weeks later. Huge crowds gathered to watch the procession, which passed from Buckingham Palace to Westminster Hall, where a small ceremony was conducted by the Archbishop of Canterbury, Randall Davidson, before a small group of official mourners – the late King's widow, Queen Alexandra, his son King George V, his daughter The Princess Victoria, his brother the Duke of Connaught, and his nephew the German Emperor. The remainder of the funeral party waited outside the Hall, consisting of thousands of people. Then the whole procession proceeded via Whitehall and the Mall, from Hyde Park Corner up to the Marble Arch, and thence to Paddington Station. From there, a train conveyed the mourners to Windsor. The procession then continued on to Windsor Castle, and a full funeral ceremony was held in St George's Chapel.