Bellini and his librettist Romani took tremendous liberties with this already unusual story and devised a plot where the King, in order to resolve the problem of his double marriage, sends Agnes to live at a cottage on Lake Montolino. Philip then sends her brother to secretly watch over her, while masquerading under the name Valdeburgo. Agnes has assumed the name of Alaide and hides under a veil. Count Arturo has fallen in love with her, in spite of his engagement to Isoletta, daughter of the Duke of Montolino. At this point the opera begins.