The Harada clan originated from the Okura clan, a direct descendant of OKURA no Haruzane, who performed distinguish services to suppress the Rebellion of Johei Tengyo (FUJIWARA no Sumitomo's rebellion).
原田氏は承平天慶の乱（藤原純友の乱）鎮圧に活躍した大蔵春実の子孫、大蔵氏の嫡流。