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In page Joanna, Duchess of Durazzo:

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Joanna's father died in 1348 and Joanna succeeded him, being the eldest surviving child. However, Joanna remained in Naples rather than going to Durazzo.[citation needed] It was here she was betrothed to her cousin Charles Martel, Duke of Calabria, son of Queen Joanna. Charles Martel was heir in Hungary due to a lack of male heirs. The boy was moved to Hungary, however the engagement was broken when the young boy died around 1348 in Hungary.[citation needed]