In 1825, Canning was returned to Constantinople, this time as Ambassador. He fled the city following the Battle of Navarino in 1827, but after a brief return to London he, along with the French and Russian ambassadors who had also fled, set up camp at Poros. In 1828 he and the other ambassadors participated in the Conference of Poros, which recommended to their respective governments the establishment of a separate Greek state, including the islands of Crete, Samos, and Euboea. Although he had been encouraged in this generous position towards the Greeks by his superior, Lord Aberdeen, this move was disavowed by the government, and Canning resigned.