With little options left, Paul turned to the
Ottoman Empire for military assistance. In 1406, an Ottoman force crossed into western Greece to support him, but the campaign quickly fell apart. Many Ottoman troops drowned attempting to cross the swollen
Acheloos River, and the survivors were defeated near
Vonitsa. Following the failed campaign, the Ottoman commander Yusuf Beg signed a treaty with Carlo I Tocco, leaving Paul without any meaningful allies. Paul then gave up Angelokastron to the Ottomans and withdrew to
Naupaktos, the last remaining stronghold under his control. With Venice already showing interest in the strategically valuable port, Paul entered negotiations. In May 1407, Paul formally agreed to sell Naupaktos to the
Republic of Venice for 1,500
ducats, finalizing the transfer by mid-1408. His brother-in-law
Francesco Foscari, a Venetian noble married to his sister
Sterina Shpata, may have helped broker the deal. Paul disappears from the historical record after the sale, marking the end of Spata family rule in Aetolia and Acarnania. By that time, Carlo I Tocco had consolidated control over the entire region. Venetian documents confirm that Angelokastron was under his control by July 1408, and he delegated its administration along with Katochi and the Acheloos valley to his loyal Albanian ally Dimo Boua. ==Depiction==