Kiabar Kohen Samson (KYBR) of Kopyriv Kinets' c.950 was a Jewish descendant of Bulan and the E-A14039 ancestor of the Eastern Yiddish קויפערץ/kuipfertz (Buyers). His ancestors had split with the Kara-Khazars and assisted in the establishment of the Rus' Khaganate. The descendants of the Kabar Count Samuel Aba also belong to this Haplogroup.