Castel dell'Ovo
Around 1376 Joanna remarried to Robert IV of Artois, Count of Eu. This marriage was also childless. Robert was not Count of Eu for long, he and Joanna were not informed of his father's death in 1387. Joanna and Robert were staying at Castel dell'Ovo in Naples where they were both poisoned on July 20, 1387 on the orders of Joanna's sister Margaret, queen dowager and regent of Naples.