"The Quadruple Monarchy, as it was commonly called, came into existence when in 1497, king Pedro IV of Castille died without heir, and his empire of Castille-Portugal was inherited by his only daughter's husband, Edward V of England-Scotland, and united with the latter."@en . . . . "Quadruple Monarchy (Chaos)"@en . . . . . . . . . . . . . "The Quadruple Monarchy, as it was commonly called, came into existence when in 1497, king Pedro IV of Castille died without heir, and his empire of Castille-Portugal was inherited by his only daughter's husband, Edward V of England-Scotland, and united with the latter."@en . .