As a result of the investigation of Kiyohira's body buried at Konjiki-do Hall, his blood type is AB and there is no contradiction about the direct line of four generations down to his great-grandson FUJIWARA no Yasuhira.
金色堂に納められた清衡の遺骸を調査した結果、血液型はAB型であり、曾孫の藤原泰衡まで四代直系で矛盾はないとされる。