White Serbia, also known as Bojka (Serbian Cyrillic: Бојка), is the area of modern-day eastern Germany and western Poland inhabited by White Serbs in the early medieval ages. According to another theory, White Serbia was located between modern-day Poland, Slovakia, and Ukraine.
White Serbs were a Slavic tribe, which lived in the region around river Elbe (today in eastern Germany and western Poland) in the early medieval ages. The direct descendants of White Serbs are present-day Lusatian Serbs (Sorbs). The land where White Serbs lived is known as White Serbia.
Part of the White Serbs migrated to Balkans in 610-641 led by the Unknown Archont. The White Serbs were first given the province of Thessalonica by the Roman emperor Heraclius but later they settled in the province of Dalmatia (parts of the present-day Serbia and Montenegro and Bosnia and Herzegovina).
From the II to the VII century A.D. we have no authoritative historical sources at all on the Serbs. The Frankish chronicler Fredigar was the first to mention the Serbs in 631. The Serbs were already Slavicized and lived on the east bank of the middle Elbe. On the subject of the war waged by the Frankish king Dagobert in 631 against Samo, king of the Slavic Wends, Fredegar writes:
"The Wends invade Thuringia and other dominions of the Frankish kingdom and plunder Dervan as well, duke of the Serbs, of Slavic race and previously a vassal of the Frankish king has gone over with all his men to the king of the Wends." (50)
Fredegar’s account of the Wends living on the boundaries of Thuringia in 632 and 641 refers to the Serbs as well. (51) The northern Serbs remained independent of the Franks right up to the first years of Charlemagne’s reign (768 – 814). The Frankish chronicler Einhard writes about them in 782:
"The Slavic Serbs living in the areas between the Elbe and the Saale have overrun the Thuringian and Saxon dominions in order to plunder them." (52)
The Arab writers (53) and the Anglo-Saxon king Alfred (54) mention the northern Serbs in the IX century. Constantine Porphyrogenitus writes in his "De administrando imperio":
"These Serbs come from the non-Christianized Serbs, called the White, living beyond the Turks (Hungary) in the area which they call Bojki (Bohemia). The Franks and Great Croats i.e. non-Christianized Croats, also called White, are their neighbours. There, then, have these Serbs lived from olden times." (55)