My way of thinking was that "muromachi" and "rest of muromachi" should end up on the same row in the list at the top, which is why I had it like this
Muromachi Period
XYZ
ABC
Rest of Muromachi Period
Not sure what looks better.
There was a discussion about periods on the S-A forum [1]
Maybe someone could fill in the article with information for pre-Nara periods.--Bethetsu 20:53, 20 June 2007 (PDT)