of Ibrahim Pasha. In 1827, the Third National Assembly at Troezen selected Count Ioannis Kapodistrias as Governor of Greece for seven years. He arrived in 1828 and established the Hellenic State, commanding with quasi-dictatorial powers. He was assassinated by political rivals in 1831 and was succeeded by his brother, Augustinos Kapodistrias until the Great Powers declared Greece a Kingdom and selected the Bavarian Prince Otto to be its king. Kingdom of Greece (1832–1924) Reign of King Otto (1832–1862) 1843, 3 September: Military coup and revolution caused by the King's refusal to grant a constitution. King Otto agrees to convene a National Assembly to prepare a constitution. 1843, 15 September: Andreas Metaxas becomes the first Constitutional Prime Minister of Greece. 1844, March 18: The Greek Constitution of 1844 is voted into effect. 1850, 4 January: Pacifico incident. Blockade of the port of Piraeus by the British fleet. 1854, 14 May: Anglo-French occupation of Piraeus to ensure Greek neutrality during the Crimean War, although a Greek volunteer battalion participates in the Siege of Sevastopol. Cholera epidemic begins in the capital, transmitted by the foreign troops. 1861: Assassination attempt against Queen Amalia. 1862, 10 October: Military coup. Otto leaves the throne and the country. Reign of King George I (1863–1913) 1863: Prince William of Denmark becomes the new King of the Hellenes, as George I. 1864, 2 May: Britain donates the Ionian Islands to Greece, as coronation gift to King George I. 1864: Assassination attempt against Alexandros Koumoundouros. 1864, 7 August: Greece has a new constitution which establishes a Constitutional Monarchy. 1864, 28 November: New constitution, unicameral assembly and constitutional monarchy created. 1866: Beginning of the Great Cretan Revolution (1866–1869). The exiled King Otto donates most of his fortune for the cause. 1877, 2 September: Hero of the War of Independence and current Prime Minister Konstantinos Kanaris dies. 1878, 13 June: Beginning of the Treaty of Berlin. Eastern Rumelia becomes autonomous province of the Ottoman Empire. 1878, Summer: Cretan rebellion, halted speedily by British intervention. 1880–1920: Approximately 400,000 Greeks emigrate to America due to widespread unemployment and economic problems. 1881, 3 April: Earthquake strikes Chios. 3,550 people are reported dead. 1881: Thessaly becomes part of Greece. 1882, 3 March: Prime Minister Alexandros Koumoundouros resigns. 1885, May: Prime Minister Theodoros Deligiannis mobilizes the Greek Army in accordance with the Bulgarian revolt. Fearing modification of the Treaty of Berlin, the British Royal Navy blockades Greece.