World War I: Romania signs a secret treaty with the Entente Powers. According to the treaty, Romania agreed to join the war on the Allied side.

The Treaty of Bucharest of 1916 was signed between Romania and the Entente Powers on 4 /17 August 1916 in Bucharest. The treaty stipulated the conditions under which Romania agreed to join the war on the side of the Entente, particularly territorial promises in Austria-Hungary. The signatories bound themselves to keep secret the contents of the treaty until a general peace was concluded.

1916 - Tratatul politic 3
1916 - Tratatul politic 3 (Source: Wikimedia Commons)
1916.7.17REGAT
1916.7.17REGAT (Source: Wikimedia Commons)
Greater Rumania, New York Times, 1919
Greater Rumania, New York Times, 1919 (Source: Wikimedia Commons)
1916 - Tratatul politic 1
1916 - Tratatul politic 1 (Source: Wikimedia Commons)

Watch: Treaty of Bucharest 1916 - Prelude to Romanian Front - 7th of August, 1916

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Sources and further reading: Wikipedia — Treaty of Bucharest (1916), Kingdom of Romania, Allies of World War I (CC BY-SA). Images: Wikimedia Commons.