Why is "Beloje of Trebinje" trending?

Wikipedia Overview

Beloje, was a local Slavic chieftain from the region surrounding Trebinje, who ruled the area with a title of župan, sometime in the first half of the 9th century. Travunia was a polity centered in Trebinje, and at the time subject to the Principality of Serbia. Mentioned in De Administrando Imperio (DAI) of Byzantine Emperor Constantine VII, Beloje was a contemporary of Serbian ruler Vlastimir. 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 independent, while Vlastimir oversaw his son-in-law. T. Živković theorized that Beloje sought to free himself of Serbian rule, and that Vlastimir prevented this through a political marriage between the two families, possibly prior to the Bulgar–Serb War (839–842). Krajina's descendants were entitled the rule of Travunia under Serbian suzerainty.