Serbs of Montenegro or Montenegrin Serbs , compose the second largest ethnic group in Montenegro (28.7% of country's population), after the Montenegrins. In historiography, the Orthodox people of Montenegro were called Serbs. In the constitutions of the Principality of Montenegro and Kingdom of Montenegro, the Montenegrin people's ethnonym was Serbs. With the formation of Socialist Yugoslavia, the censuses showed a majority of people declaring as Montenegrins.