Paul Amnuel. Prime numbers (№ 173055)

... He predicted that he would die twenty-first day, and he spent his whole life in this day of the month hasn't left his bedroom. But on 21 June 1791, Louis and Marie-Antoinette were arrested, on 21 September 1792 France declared a Republic, and on 21 January 1793 the king was executed. Why so many coincidences?