Saint George is one of the most important saints in the Eastern Orthodox tradition. He is the patron military saint in Slavic, Georgian and Circassian, Cossack, Chetnik military tradition. Christian synaxaria hold that St. George was a martyr who died for his faith. On icons, he is usually depicted as a man riding a horse and killing a dragon.
Beyond Orthodox Christian tradition proper, Đurđevdan is also more generically a spring festival in the Balkans.
South Slavic tradition
St. George's Day, known as Đurđevdan (Ђурђевдан) in Serbian, is a feast day celebrated on 6 May (O.S. 23 April) in the Serbian Orthodox Church. As such, it is celebrated on that date by the Serb community in former Yugoslavia and in the Serb diaspora. It is also one of the many family slavas. It is also celebrated by the Slavic Muslim community of Gorani in Kosovo, and by members of the uncanonical Montenegrin Orthodox Church.
In Croatia, the feast day of Jurjevo is celebrated on 23 April by the Roman Catholic Croats mainly in the rural areas of Turopolje and Gornja Stubica. In Croatian George is called Juraj while in Serbian he's called Đorđe (Ђорђе); in Bulgarian Georgi (Георги) and in Macedonian Gjorgjija (Ѓорѓија).
According to tradition this day marks the beginning of spring. The use of bonfires is similar to Walpurgis Night. In Turopolje Jurjevo involves a Slavic tradition where five most beautiful girls are picked to play as Dodola goddesses dressed in leaves and sing for the village every day till the end of the holiday.
Đurđevdan is also a major holiday for the Romani communities in former Yugoslavia, whether Orthodox or Muslim. The various spellings used by the Romani (Ederlezi, Herdeljez, Erdelezi) for it are variants of the Turkish ' Hıdırellez.
In Bosnia, the major holidays of all religious groups were celebrated by all other religious groups as well, at least until religion-specific holidays became a marker of ethnic or nationalist self-assertion after the breakup of Yugoslavia. Roman Catholic Christmas, Orthodox Christmas, and the two Muslim Bajrams were widely recognized by people of all ethnic groups, as was Ðurđevdan even though it was properly an Orthodox holiday and therefore associated with Serbs.