Organa (Bu-Yurgan) was Kubrat's maternal uncle of the Ermy clan. According to John of Nikiu, he was regent (kavkhan) over the tribe of the Onogur Bulgars from 617 to 630 in place of his nephew, Kubrat, for the time Kubrat was growing up as a hostage in the Byzantine Empire and there is information that Organa accompanied Kubrat on his initial trip to Constantinople.
Read more about Organa: Honor