I don't have information about that, but Romania seized Southern Dobruja from Bulgaria in the Second Balkan War in 1913. 
 I didn't know that. Any more about Romanian history? 
 My pleasure. 
 Romania was forced to cede Bessarabia and northern Bukovina to the Soviet Union on 26 June 1940, Northern Transylvania to Hungary on 30 August, and Southern Dobruja to Bulgaria in September. 
 Did they get the territories back after the fall of the Soviet Union?
Romania was forced to cede Bessarabia and northern Bukovina to the Soviet Union on 26 June 1940, Northern Transylvania to Hungary on 30 August, and Southern Dobruja to Bulgaria in September.