It originated from Mita or Miyake before Taika, and was called Mita and Miyaketa in "Taiho Ritsuryo Code" and "the Engishiki" (an ancient book for codes and procedures on national rites and prayers), respectively.
大化以前の屯田（みた)・御宅（みやけ）に由来し、『大宝律令』では屯田といい、『延喜式』では三宅田という。