II's visit to England: Moreover, Adam of Usk reported: However, Manuel II sent a letter to his friend Manuel Chrysoloras, describing his visit to England: Manuel II later returned to France with high hopes of substantial help and funds for Constantinople. In the meantime, he sent delegations with relics including pieces of the tunic of Christ and a piece of the Holy Sponge to Pope Boniface IX and Antipope Benedict XIII, Queen Margaret I of Denmark, king Martin of Aragon and king Charles III of Navarre to seek further assistance. He eventually left France on 23 November 1402, and finally returned to Constantinople in June 1403. Renewed Ottoman sieges The Ottomans under Bayezid I were themselves crushingly defeated by Timur at the Battle of Ankara in 1402. As the sons of Bayezid I struggled with each other over the succession in the Ottoman Interregnum, John VII was able to secure the return of the European coast of the Sea of Marmara and of Thessalonica to the Byzantine Empire in the Treaty of Gallipoli. When Manuel II returned home in 1403, his nephew duly surrendered control of Constantinople and received as a reward the governorship of newly recovered Thessalonica. The treaty also regained from the Ottomans Mesembria (1403–1453), Varna (1403–1415), and the Marmara coast from Scutari to Nicomedia (between 1403–1421). However, Manuel II kept contact with Venice, Genoa, Paris and Aragon, by sending envoy Manuel Chrysoloras in 1407–8, pursuing to form a coalition against the Ottomans. On 25 July 1414, with a fleet consisting of four galleys and two other vessels carrying contingents of infantry and cavalry, departed Constantinople for Thessalonica. The purpose of this force soon became clear when he made an unannounced stop at Thasos, a normally unimportant island which was then under threat from a son of the lord of Lesbos, Francesco Gattilusio. It took Manuel three months to reassert imperial authority on the island. Only then did he continue on to Thessalonica, where he was warmly met by his son Andronicus, who then governed the city. In the spring of 1415, he and his soldiers left for the Peloponnese, arriving at the little port of Kenchreai on Good Friday, 29 March. Manuel II Palaiologos used his time there to bolster the defences of the Despotate of Morea, where the Byzantine Empire was actually expanding at the expense of the remnants of the Latin Empire. Here Manuel supervised