The couple were married shy of fourteen years and had three sons: Agnes became, through her husband's brotherly quarrel with Philip I, Prince of Taranto, duchess of Durazzo.

However, in his final will and testament, Robert instructed that if Joanna were to die without issue, the Neapolitan throne should pass to her sister, Maria, who was unmarried.

Agnes used her connection to her influential brother, Cardinal Talleyrand, to put aside the Hungarian match for Maria and obtain the Pope's permission for the ambitious marriage.

[9] Not relying on family feeling alone, Agnes bribed her brother with 22,000 florins left over from her dowry in order to ensure absolute support.

Catherine instructed the young queen to oppose the match, hoping that the lack of royal favour would act as a deterrent.

[12] Much to the dismay of the Tarantos, their control over Joanna was not enough to prevent Agnes, who responded by abducting Maria one night in April 1343 and marrying her off to Charles.

[13] The marriage was a great insult to Joanna and Andrew as their royal authority was defied and the latter's family lost out on their chance for total control of the succession.

[15] The letter to Agnes also informs that the Pope was sending Talleyrand's chamberlain, Roger of Vintrono, who had experience in the Papal service in Italy, to mend the breach amongst the Neapolitans.

As the latter was initially refused joint authority with his wife, he wrote to his mother Elisabeth, announcing plans to flee Naples.

[23] Although, it is quite possible that these events are fictional, they are accounted by Domenico de Gravina, whom as noted from the encounter with Elisabeth, appeared sympathetic to Agnes rather than Joanna and Catherine.

[24] Charles and Maria never ascended the throne, the former was executed three years after the death of his mother for his own political intrigues involving Joanna and the Hungarians.