In 764 when Nakamaro raised a rebellion (the Rebellion of FUJIWARA no Nakamaro), Sukunamaro was issued imperial rescript and defeated Nakamaro with leading several hundred troops and then gave Jushiinoge (Junior Fourth Rank, Lower Grade).
天平宝字8年（764年）、仲麻呂が反乱を起こすと（藤原仲麻呂の乱）、宿奈麻呂は詔勅を受け兵数百人を率いてこれを討ち、従四位下を授けられた。