Fürstentum Tarent
In 1417 Giannantonio married Pope Martin V's niece Anna Colonna, daughter of the Prince of Amalfi. After James II' renounce, he received the Principality of Taranto from queen Joanna II of Naples on 4 May 1421. This act made him the most powerful baronial lord of the Kingdom of Naples, with lands including 7 archbishoprics, 30 bishoprics, 300 castles an extending from Salerno to Taranto.