Question: Who allied with Bulgaria at Adrianopole in the First Balkan War?
About the article "Balkan Wars", section "First Balkan War".

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Greater Bulgaria was suggested under the Treaty of San Stefano.
The issue of irredentism and nationalism gained greater prominence after the creation of modern Bulgaria following the 1878 Treaty of San Stefano.
However the Congress of Berlin took back some of those territories, returning them to the control of the Ottoman Empire.
In the early 20th century control over Macedonia was a key point of contention between Ottoman Empire, Bulgaria, Greece, and Serbia who fought both the First Balkan War of 1912–1913 and the Second Balkan War of 1913.
The area was further fought over during the Macedonian Campaign of World War I (1915–1918).
Just before entering World War II, Bulgaria had peacefully secured the return of Southern Dobruja from Romania in the Treaty of Craiova.
Greater Bulgaria was re-created as a state during World War II by Nazi Germany, as a reward to Bulgaria, which had fought with Germany as one of the Axis powers.
It was granted territory in Greece, namely Eastern Macedonia and parts of Western Thrace, as well as Yugoslav Macedonia (Vardar Macedonia).
With the exception of the Southern Dobruja, these concessions were reversed with the Allied victory ("see the Paris Peace Conference"). 
The town was first mentioned in a 15th-century source as "Uradmur".
The current form appears for the first time in a source from 1488.
The name is derived directly from the personal name "Radomir" or its adjectival form.
In 1918, Bulgaria was ruled by Ferdinand of Bulgaria, under whom Aleksandar Stamboliyski had been imprisoned for opposing Bulgaria's participation in the Balkan War and its alliance with the Central Powers in World War I.
When in September the Allied forces broke into Bulgaria, Ferdinand agreed to release Stamboliyski in return for a promise to help restore order in the military.
However, Stamboliyski instead aligned himself with the uprising and in Radomir proclaimed Bulgaria to be a republic.
His supporters then attempted an attack on Sofia.
The Radomir Rebellion was stopped when this force was defeated by Bulgarian and German tsarists, who also did not retain control for long as Bulgaria had signed an armistice with the Allies by the end of the month. 
Following the First Balkan War, Bulgaria took the city of Xanthi in 1912, but during the Second Balkan War in summer 1913 it was captured by the Greek army.
Shortly thereafter, as part of the accords concluding the Balkan Wars, Xanthi and Western Thrace were ceded to Bulgaria (where it was also called Скеча "Skecha"), and remained a part of the latter until the end of World War I.
Following the Bulgarian defeat in this war, the southern parts of Western Thrace came under Allied administration, before being ceded to Greece in the Treaty of Neuilly (1920).
In the period 1941–1944, during the Axis Occupation of Greece, the city was annexed by Bulgaria. 
The Balkan League (, "Balkanski sŭyuz", "Balkaniki Symmachia", "Balkanski savez") was an alliance formed by a series of bilateral treaties concluded in 1912 between the Balkan states of Greece, Bulgaria, Serbia and Montenegro, and directed against the Ottoman Empire, which at the time still controlled much of the Balkan peninsula.
The Balkans had been in a state of turmoil since the early 1900s, with years of guerrilla warfare in Macedonia followed by the Young Turk Revolution and the protracted Bosnian Crisis.
The outbreak of the Italo-Turkish War in 1911 had further weakened the Ottomans and emboldened the Balkan states.
Under Russian influence, Serbia and Bulgaria settled their differences and signed an alliance, originally directed against Austria-Hungary on 13 March 1912, but by adding a secret chapter to it essentially redirected the alliance against the Ottoman Empire.
Serbia then signed a mutual alliance with Montenegro, while Bulgaria did the same with Greece.
The League was victorious in the First Balkan War which broke out in October 1912, where it successfully wrestled control of almost all European Ottoman territories.
Following this victory however, the old differences between the allies re-emerged over the division of the spoils, particularly Macedonia, leading to the effective break-up of the League, and soon after, on 16 June 1913, Bulgaria attacked her erstwhile allies, beginning the Second Balkan War. 
The Second Balkan War was a conflict which broke out when Bulgaria, dissatisfied with its share of the spoils of the First Balkan War, attacked its former allies, Serbia and Greece, on 16 (O.S.
)/29 June 1913.
Serbian and Greek armies repulsed the Bulgarian offensive and counter-attacked, entering Bulgaria.
With Bulgaria also having previously engaged in territorial disputes with Romania, this war provoked Romanian intervention against Bulgaria.
The Ottoman Empire also took advantage of the situation to regain some lost territories from the previous war.
When Romanian troops approached the capital Sofia, Bulgaria asked for an armistice, resulting in the Treaty of Bucharest, in which Bulgaria had to cede portions of its First Balkan War gains to Serbia, Greece and Romania.
In the Treaty of Constantinople it lost Edirne to the Ottomans.