Slavs
Slavs can be further grouped by religion. Orthodox Christianity is practiced by the majority of Slavs. The Orthodox Slavs include the Belarusians, Bulgarians, Macedonians, Montenegrins, Russians, Serbs, and Ukrainians and are defined by Orthodox customs and Cyrillic script as well as their cultural connection to the Byzantine Empire (Serbs also use Latin script on equal terms). Their second most common religion is Roman Catholicism. The Catholic Slavs include Croats, Czechs, Kashubs, Moravians, Poles, Silesians, Slovaks, Slovenes, and Sorbs and are defined by their Latinate influence and heritage and connection to Western Europe. There are also substantial Protestant and Lutheran minorities especially amongst the West Slavs, such as the historical Bohemian (Czech) Hussites.
History of Ukrainian nationality
The history of Ukrainian nationality can be traced back to the Kiev-based kingdom of Kievan Rus' () of the 9th to 12th centuries. It was the predecessor state to what would eventually become the Eastern Slavic nations of Belarus, Russia, and Ukraine. During this time, Eastern Orthodoxy, a defining feature of Ukrainian nationalism, was incorporated into everyday life.