Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In 1343 Robert I, the Sage, King of Naples, died. His only son, Charles of Calabria, had died in 1328, leaving two daughters, one of which, Joan, had been married to Andrew, son of king Charles I of Hungary. During his sojourn Naples, Andrew gained the fierce hostility of her more refined wife. After her father''s death, she received by the Avignonese Pope Clement VI the official investment of the Kingdom, which was then nominally a vassal of the Papal States. Andrew, who aimed also to the crown, received only the title of Duke of Calabria. On June 14, 1345 Clement, after a payment of 44,000 marks, accepted to yield Andrew the title of king, but only as heir in case of Joan''s death. Joan, who had an affair with Louis of Taranto, was at the time under the strong influence of the latter''s mother, Catherine of Valois.