As has been said before, the original difference between the two was that the Colonna were Ghibellines and for the Emperors, while the Orsini were Guelphs and generally adhered to the Popes. In the violent changes of the Middle Age, it happened indeed that the Colonna had at least one Pope of their own, and that more than one, such as Nicholas the Fourth, favoured their race to the point of exciting popular indignation. But, on the whole, they kept to their parties. When Lewis the Bavarian was to be crowned by force, Sciarra Colonna crowned him; when Henry the Seventh of Luxemburg had come to Rome for the same purpose, a few years earlier, the Orsini had been obliged to be satisfied with a sort of second-rate coronation at Saint John Lateran's; and when the struggle between the two families was at its height, nearly two centuries later, and Sixtus the Fourth 'assumed the part of mediator,' as the chronicle expresses it, one of his first acts of mediation was to cut off the head of a Colonna, and his next was to lay regular siege to the strongholds of the family in the Roman hills; but before he had brought this singular process of mediation to an issue he suddenly died, the Colonna returned to their dwellings in Rome 'with great clamour and triumph,' got the better of the Orsini, and proceeded to elect a Pope after their own hearts, in the person of Cardinal Cibo, of Genoa, known as Innocent the Eighth. He it is who lies under the beautiful bronze monument in the inner left aisle of Saint Peter's, which shows him holding in his hand a model of the spear-head that pierced Christ's side, a relic believed to have been sent to the Pope as a gift by Sultan Bajazet the Second.