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| 1868 | Birth |  |
| 12th July Athens Birth of Constantine I, eldest son of George I |
| 1889 | Marriage | |
| Athens Marries Sophia, sister of Kaiser William II |
| 1897 | Defeat | |
| Leads Greece to defeat against Turkey |
| 1909 | Exile of Constantine I | |
| Forced into exile by army officers |
| 1912 | Battle of Elasson | |
| 23rd Oct Elasson Defeats the Turtks in the Vardar Valley |
| 1912 | Battle of Kastoria | |
| Kastoria One of Constantine's flank detachments is defeated by the Turks |
| 1912 | Battle of Monista | |
| Monista One of Constantine's flank detachments is defeated by the Turks |
| 1912 | Battle of Venije | |
| 5th Nov Venije Overwhelms the Turks & moves on to Salonika |
| 1912 | Capture of Salonika | |
| 9th Nov Salonika The Turkish garrison of 20,000 surrenders & Constantine occupies the city |
| 1912 | Invasion of Macedonia | |
| Greece lands forces in the Halkidiki peninsula while the main force of the army attacks from Thessaly into Macedonia through the Sarantaporo straight |
| Macedonia Leads a Greek Army into Macedonia to attack the Turks in the Varar Valley |
| 1912 | Invasion of Thessaloniki | |
| 26th Oct After the liberation of Thessaloniki, the Greek army links up with the Serb army north and they turns west |
| 1912 | Invasion of Turkey | |
| Oct Members of the Balkan League attack Turkey & win quick victories |
| 1912 | Rule of Aegean | |
| Aegean The Greek Navy is free to liberate the islands of the Aegean, starting with Lemnos which was used as a base to monitor the Dardanelles |
| Dec Aegean Following a ceasefire in December between the Ottoman Empire and Bulgaria, Serbia and Montenegro, the Turkish fleet twice exited the Dardanelles but was twice defeated in the battles of Elle and Lemnos |
| 1912 | Rule of Lemnos | |
| Lemnos The Greek Navy is free to liberate the islands of the Aegean, starting with Lemnos which was used as a base to monitor the Dardanelles |
| 1913 | Alliance | |
| 19th May Greece and Serbia signed a treaty of mutual defence against an attack, a mutual border is agreed between the two and an agreement for mutual diplomatic support |
| June Dodecanese Romania, Greece, Montenegro, and Turkey immediately side with Serbia and declares war on Bulgaria, which found itself completely isolated |
| 1st June An anti Bulgarian Serbian-Greek alliance is signed |
| 24th June Greece & Serbia break their alliance with Bulgaria over the Macedonia & Thrace border |
| 1913 | Balkan League | |
| 19th May Greece and Serbia signed a treaty of mutual defence against an attack, a mutual border is agreed between the two and an agreement for mutual diplomatic support |
| 1913 | Battle of Doiran | |
| June Doiran The Greeks defeat the Bulgarian army in the battles of Doiran and Mt. Beles before themselves being defeated at the Kresna straights |
| 1913 | Battle of Kilkis Lahanas | |
| 19th May Kilkis Lahanas The Greek army counterattacks and defeats the Bulgarians at Kilkis-Lahanas |
| 1913 | Battle of Kresna | |
| June Kresna The Greeks defeat the Bulgarian army in the battles of Doiran and Mt. Beles before themselves being defeated at the Kresna straights |
| 1913 | Battle of Mount Beles | |
| June Mount Beles The Greeks defeat the Bulgarian army in the battles of Doiran and Mt. Beles before themselves being defeated at the Kresna straights |
| 1913 | Capture of Adrianople | |
| 26th Mar Adrianople A combined Bulgar-Serb force captures Adrianople |
| 1913 | Capture of Ioannina | |
| Ioannina Bulgarian forces conquer Adrianople while Greek forces liberated Ioannina |
| 1913 | Capture of Yanina | |
| 3rd Mar Yanina The Turkish garrison of 30,000 falls to Prince Constantine of Greece |
| 1913 | Death | |
| Death of George I, assassinated |
| 1913 | Declaration of War | |
| June Dodecanese Romania, Greece, Montenegro, and Turkey immediately side with Serbia and declares war on Bulgaria, which found itself completely isolated |
| 24th June The Macedonia & Thrace border dispute with Bulgaria causes the 2nd Balkan War |
| 1913 | Peace | |
| June Kresna The Greeks offered a ceasefire and the Bulgarians accept due to the danger posed by the Romanian army in the north |
| 1913 | Rule of Aegean | |
| 13th Dec Aegean Greece is awarded some Aegean Islands for the loss of southern Albania to Albania |
| 1913 | Rule of Albania | |
| 13th Dec Southern Albania is divided between Albania & Greece |
| 1913 | Rule of Crete | |
| June Crete Crete and Salonika were definitively assigned to Greece |
| 1913 | Rule of Dodecanese | |
| June Dodecanese Greece protested Italy's annexation of the Dodecanese |
| 1913 | Rule of Ioannina | |
| Ioannina Bulgarian forces conquer Adrianople while Greek forces liberated Ioannina |
| 1913 | Rule of Macedonia | |
| 13th Dec Greece gains territory in Macedonia |
| 1913 | Rule of Salonika | |
| June Salonika Crete and Salonika were definitively assigned to Greece |
| 1913 | Rule of Samos | |
| Samos the Greek fleet raises the Greek flag on Samos |
| 1913 | Rule of Thrace | |
| 13th Dec Thrace Greece gains territory in Thrace |
| 1913 | Siege of Serres | |
| June Serres the Greek army does not enter the city of Serres in time to prevent it being razed by irregular Bulgarian units |
| 1913 | Succession | |
| 18th Mar Salonika Succeeds as King of Greece in the newly occuppied city of Salonika |
| 1913 | Treaty of London | |
| 17th May London The war was ends with the treaty of London |
| 17th May London Under the treaty of London Albania is declared independent, Serbia, Montenegro and Greece are obliged to withdraw their forces |
| 1914 | Neutrality | |
| Greece is forced to remain neutral because of Allied naval power |
| 1915 | Battle of Dardanelles | |
| Dardanelles Venizelos resigns over Constantine's policy |
| Dardanelles Venizelos wishes to send 3 Greek Divisions to the Dardanelles Constantine refuses |
| 1915 | Election | |
| Mar Venizelos wins the election & is returned to power |
| 1915 | Siege of Salonika | |
| Mar Salonika Urges the Germans to invade Greece & recapture Salonika from the Allies |
| 1916 | Capture of Fort Rupel | |
| May Fort Rupel Bulgaria captures Fort Rupel & enters Macedonia, a threat to the Allies |
| 1916 | Capture of Kavalla | |
| Aug Kavalla Bulgaria captures the port of Kavalla |
| 1916 | Government | |
| Venizelos forms a rival government in Crete & Salonika with Allied support |
| 1916 | Siege of Athens | |
| 1st Dec Athens Greek royalist troops attack an Allied landing party |
| 1917 | Abdication | |
| 12th June Athens Abdicates in favour of his younger son Alexander |
| 1917 | Capture of Athens | |
| Athens The Allies occupy Athens to counter Constantine's support for the Central Powers |
| 1920 | Death | |
| Death of Alexander, his younger son who was ruling Greece |
| 1920 | Exile of Constantine I | |
| Athens Constantine I returns to Greece after the defeat of Venizrlos at the election |
| 1920 | Plebiscite | |
| Athens Succeeds as King of Greece, restored after a plebiscite |
| 1920 | Restoration | |
| Athens Succeeds as King of Greece, restored after a plebiscite |
| 1920 | Succession | |
| Athens Succeeds as King of Greece, restored after a plebiscite |
| 1922 | Abdication | |
| 26th Sep Athens Abdicates for the 2nd time after the Greek defeat by Turkey |
| 1923 | Death | |
| 11th Jan Palermo Death of Constantine I |
