According to "Shoku Nihongi" (an imperially commissioned Japanese history text), MORO no Kurao, a Watarishima Tsugaru no tsu no tsukasa (official), was dispatched in 720 to take surveys on the local customs in Makkatsu (Mohe (or Malgal, Mogher), a Tungusic people in ancient Manchuria) Province.
『続日本紀』によると、720年（養老4年）渡嶋津軽津司諸鞍男を風俗視察のため靺鞨国に派遣したとある。