Joanna I of Naples

Joanna inherited Naples at seventeen in 1343 after her grandfather Robert named her sole heir over the protests of Hungarian relatives who'd married her to Prince Andrew. Two years later Andrew was found strangled, his death launching decades of war with his brother Louis I of Hungary and suspicion that never left her. She married three more times — Louis of Taranto, the titular King of Majorca, a Duke of Brunswick — but produced no surviving children. When the Western Schism split the papacy, she backed Avignon; Rome declared her a heretic and usurper in 1380. Her sister's son Charles of Dura…