Balkan League
The Balkan League forms against the Ottoman Empire.
Role range: 1912-1913 – 1887-1918
Historical biography archive · Updated 2026-11-03
Ferdinand Ferdinand I Biography and Timeline
Follow Ferdinand Ferdinand I through 47 dated historical records for Bulgaria.
Ferdinand Ferdinand I, historical timeline
A chronological timeline drawn from matching World History Database records.
47Distinct records
1 of 2Page
1911–1913Years on this page
1911
Coup
Following Italy's victory in the Italo-Turkish War of 1911-1912 the Young Turks fell from power after a coup, the Balkan countries see this as an opportunity to attack and fulfill their desires of expansion
Role range: 1912-1913 – 1887-1918
1912
Balkan League
The signing of a secret bilateral defensive alliance between Serbia and Bulgaria. Serbia and Bulgaria sign treaties to split between them the land of Vardarrr Macedonia
Role range: 1912-1913 – 1887-1918
Serbo-Bulgarian Alliance
Approves the secret alliance with Serbia.
Role range: 1912-1913 – 1887-1918
Balkan League
Expanded by a military contract
Role range: 1912-1913 – 1887-1918
Balkan League
This agreement is later followed by a similar one between Bulgaria and Montenegro, thus forming a network of alliances in the Balkans, aimed at Turkey.
Role range: 1912-1913 – 1887-1918
Greco-Bulgarian Treaty
Greece, not wishing to be left out of a possible alliance against the Ottoman Empire and the corresponding partition of territory, begins negotiations with Bulgaria on a defensive alliance resulting in the Greco-Bulgarian Treaty
Role range: 1912-1913 – 1887-1918
Greco-Bulgarian Treaty
Concludes a defensive treaty with Greece.
Role range: 1912-1913 – 1887-1918
Balkan League
The first state to declare war is Montenegro, starting the First Balkan War. After issuing an ultimatum to the Porte on October 13, Bulgaria declares war on Turkey on October 17
Role range: 1912-1913 – 1887-1918
Declaration of War
After issuing an ultimatum to the Porte on October 13, Bulgaria declares war on Turkey on October 17
Role range: 1912-1913 – 1887-1918
Balkan League
The First Balkan War breaks out following an impossible ultimatum given to the Porte
Role range: 1912-1913 – 1887-1918
Chatalja Line
Bulgarian forces fail to break the Chatalja line.
Role range: 1912-1913 – 1887-1918
Battle of Elli
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 Elli and Lemnos
Role range: 1912-1913 – 1887-1918
Battle of Lemnos
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 Elli and Lemnos
Role range: 1912-1913 – 1887-1918
Ceasefire
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 Elli and Lemnos
Role range: 1912-1913 – 1887-1918
Invasion of Ottoman Territory
Bulgaria attacks Eastern Thrace, stopped at the outskirts of Constantinople in the Chatalja line
Role range: 1912-1913 – 1887-1918
Partition
An alliance is agreed between Bulgaria and Serbia to partition Macedonia
Role range: 1912-1913 – 1887-1918
1913
Enos-Midia Settlement
Accepts a peace that transfers Ottoman territory west of the Enos-Midia line to the Balkan allies.
Role range: 1912-1913 – 1887-1918
Rule of Thrace
The treaty transfers Ottoman territory west of the Enos-Midia line to the Balkan allies, creating major Bulgarian expectations in Thrace.
Role range: 1912-1913 – 1887-1918
Alliance Bulgaria and Serbia and Greece
An anti Bulgarian Serbian-Greek alliance is signed
Role range: 1912-1913 – 1887-1918
Balkan League
Bulgaria attacks first, without formally declaring war, attacking the Serbian army in Gevgelija and then the Greek army in Nigrita
Role range: 1913-1913 – 1887-1918
Siege of Gevgelija
Bulgaria attacks first, without formally declaring war, attacking the Serbian army in Gevgelija and then the Greek army in Nigrita
Role range: 1913-1913 – 1887-1918
Siege of Nigrita
Bulgaria attacks first, without formally declaring war, attacking the Serbian army in Gevgelija and then the Greek army in Nigrita
Role range: 1913-1913 – 1887-1918
Battle of Kilkis-Lahanas
Bulgarian forces lose ground to Greece.
Role range: 1913-1913 – 1887-1918
Declaration of War
Greece and Serbia break with Bulgaria over the Macedonia and Thrace border
Role range: 1912-1913 – 1887-1918
Declaration of War
Romania raises an army and declares war on Bulgaria
Role range: 1913-1913 – 1887-1918
Retreat from Serres
Bulgarian forces retreat after burning parts of Serres.
Role range: 1913-1913 – 1887-1918
Battle of Kilkis-Lahanas
The Greek army counterattacks and defeats the Bulgarians at Kilkis-Lahanas
Role range: 1913-1913 – 1887-1918
Dispute over Macedonia
Disputes Macedonia with Serbia and Greece after London.
Role range: 1913-1913 – 1887-1918
Siege of Serres
The Greek army does not enter the city of Serres in time to prevent it being razed by irregular Bulgarian units
Role range: 1913-1913 – 1887-1918
Request for Armistice
Seeks peace as enemies advance on several fronts.
Role range: 1913-1913 – 1887-1918
Battle of Kresna
Part of the Greek army advances up the Struma River valley, defeating the Bulgarian army in the battles of Doiran and Mt Beles before themselves being defeated at the Kresna straights
Role range: 1913-1913 – 1887-1918
Battle of Mount Beles
Part of the Greek army advances up the Struma River valley, defeating the Bulgarian army in the battles of Doiran and Mt Beles before themselves being defeated at the Kresna straights
Role range: 1913-1913 – 1887-1918
Ceasefire
Romanian intervention threatens Sofia and forces Bulgaria toward peace.
Role range: 1913-1913 – 1887-1918
Invasion of Bulgaria
The Romanians encounter little resistance from the Bulgarians, and by the time of the ceasefire are only 30 kilometers from Sofia
Role range: 1913-1913 – 1887-1918
Peace
The Greeks offer a ceasefire and the Bulgarians accept due to the danger posed by the Romanian army in the north
Role range: 1913-1913 – 1887-1918
Treaty of Bucharest
A final peace is agreed in the Treaty of Bucharest
Role range: 1913-1913 – 1887-1918
Treaty of Bucharest
Accepts territorial losses after defeat.
Role range: 1913-1913 – 1887-1918
Treaty of Constantinople
Recognises Ottoman recovery of Eastern Thrace.
Role range: 1913-1913 – 1887-1918
Capture of Adrianople
Bulgarian forces conquer Adrianople while Greek forces liberate Ioannina
Role range: 1912-1913 – 1887-1918
Records, sources and methodology
These dates and descriptions come from the historical_events database. Exact duplicate records have been collapsed. Names are grouped by the country, Name 2 and Name 1 fields; records with missing Name 2 cannot be reliably assigned to an individual biography. Check the underlying sources before formal citation.