On 11 November 1924, King Vajiravudh amended the Palace Law outlining a list of succession which adhered strictly to the Rules of Primogeniture, clearly stating that the son of a deceased heir would have precedence over the younger brother of his late father. This followed the European concept of primogeniture with added difference that whilst in Europe all male offspring would have their place in the line of succession, in Thailand rights of succession are only to be found in the male offspring who are descended from the King by royal consorts. King Vajiravudh also clearly outlines the various groups of consorts and grants rights of succession to their descendants in order of the seniority of the title of the consort – that is, the descendants of a consort of the first rank come before those of a consort of the second rank in the list of succession, and so on. The system applies equally to his own reign as to all previous and future reigns of the Chakri Dynasty. Thus, if the line of the reigning King fails, on his death one searches amongst the line of his predecessor for an heir, and if that line has failed, amongst the line of his predecessor. Rights of succession are thus clearly vested in all lines of descent from King Rama I through a King and a royal consort.