It was divided into Bizen (備前), Bitchū (備中), and Bingo (備後) Provinces in the late 7th century, and Mimasaka Province was separated from Bizen Province in the 8th century. The first three provinces took a kanji from the name of Kibi, and added zen, chū, and go ("near," "middle," and "far") according to their distance from the capital region.
- Nussbaum, Louis-Frédéric and Käthe Roth. (2005). Japan encyclopedia. Cambridge: Harvard University Press. ISBN 978-0-674-01753-5; OCLC 58053128