Socialist Soviet Republic of Lithuania and Belorussia
Lithuanian–Belorussian Soviet Socialist Republic or Litbel was a Soviet republic.  It was in the territories of modern Belarus and eastern Lithuania.  It existed for about seven months during 1919. It was formed after the merger of Lithuanian Soviet Socialist Republic and the Socialist Soviet Republic of Byelorussia. The republic was went away after the Polish Army took over its claimed territory of eastern Lithuania during the Polish–Soviet War.