In all their troubles the Greeks never quite lost heart. The merchants who had thriven in trade sent their sons to be educated in France, Russia, and Germany, and these learned to think much of the great old deeds of their forefathers, and they formed a secret society among themselves, called the _Hetaira_, which in time the princes and nobles of the Peloponnesus joined; so that they felt that if they only were so united and resolute as to make some Christian power think it worth while to take up their cause in earnest, they really might shake off the Turkish yoke. In 1820, Ali Pasha, the governor of Albania, rebelled, and shut himself up in the town of Yanina, stirring up the Greeks to begin fighting on their own account, so as to prevent the Sultan from using all his power to crush him. So the Greeks began, under Prince Ipsilanti, who had served in the Russian army, to march into the provinces on the Danube; but they were not helped by the Russians, and were defeated by the Turks. Ipsilanti fled into Austria; but another leader, called George the Olympian, lived a wild, outlaw life for some years longer, but as he had no rank the Greeks were too proud to join him. At last he shut himself up in the old convent of Secka, and held it out against the Turks for thirty-six hours, until, finding that he could defend it no longer, he put a match to the powder, and blew himself and his men up in it rather than surrender. But the next year there was another rising all over Greece. The peasants of Attica drove the Turkish garrison out of all Athens but the Acropolis; the Suliots rose again, with secret encouragement from Ali Pasha, and hope seemed coming back. But when Omar Pasha had been sent from Constantinople with 4000 Turkish troops, he found it only too easy to rout 700 Greeks at Thermopylæ, and, advancing into Attica, he drove back the peasants, and relieved the Turkish garrison in the Acropolis, which had been besieged for eighty-three days; but no sooner had he left the place than the brave peasants returned to the siege.