Louis's brother Andrew was murdered in Aversa on 18 September 1345. Louis and his mother accused Queen Joanna I, Prince Robert of Taranto, Duke Charles of Durazzo, and other members of the Neapolitan branches of the Capetian House of Anjou of plotting against Andrew. In his letter of 15 January 1346 to Pope Clement VI, Louis demanded that the pope dethrone the "husband-killer" queen in favor of Charles Martel, her infant son by Andrew. Louis also laid claim to the regency of the kingdom during the minority of his nephew, referring to his patrilinear descent from the first-born son of Robert the Wise's father, Charles II of Naples. He even promised to increase the amount of yearly tribute that the kings of Naples would pay to the Holy See. After the pope failed to fully investigate Andrew's murder, Louis decided to invade southern Italy. In preparation for the invasion, he sent his envoys to Ancona and other Italian towns before summer 1346.