Isabella was captured with her brother and stepmother by her uncle King Peter after the battle in which her father was killed.
[3] On 4 September 1358, Isabella married John II Palaiologos, Marquess of Montferrat, in Montpellier, with the contract being officially signed 12 October 1358.
[7] She succeeded to the titles and pretensions for the Kingdom of Majorca, as well as the actual lands, from her brother James IV, who supposedly died in her arms, on his death in 1375.
In her attempt to reclaim the throne, Isabella tried to adopt Louis I, titular king of Sicily and Jerusalem, as her heir and co-regent in 1375, but seems to have lost claim to Joanna I of Naples.
Louis's successors continued to include Majorca among their titles although they never attempted a conquest of the island kingdom.