Beloje (Serbian Cyrillic: Белоје; Greek: Βελάης; fl. 839) was the župan of Travunia some time in the first half of the 9th century. Travunia was a polity centered in Trebinje (now in southern Bosnia and Herzegovina), subject to the Principality of Serbia. Mentioned in De Administrando Imperio (DAI) of Byzantine Emperor Constantine VII (r. 945–959), Beloje was a contemporary of Serbian ruler Vlastimir (r. 836–851). It is unknown how he came to the position; it might have been through the primogeniture principles, however, there is no definite answer. Vlastimir married his daughter to Beloje's son Krajina, and "desiring to ennoble his son-in-law", elevated his rank to archon (prince) and made him independent. Travunia was thus elevated from a župa into an archonty (principality), practically