Beloar

Population (according to the last census before being conquered): 2,740,000

Beloar was a nation that was located in what is now the northwest corner of Austro. Beloar and Austro both formed when Gretora split up. It did not last very long, unfortunately. Austro was very aggressive and soon began to attack Beloar. Austro was larger in both population and size, so Beloar didn't stand much of a chance. After existing for only two centuries, it was annexed by Austro.