Japan Castle Atlas

Rokkaku Ujiyori

六角氏頼

Builder and lord records come from the Japan Castle Foundation list and Japanese Wikipedia.

Connected castles

Ōmihachiman, Shiga

観音寺城

On the mountain next to Nobunaga's Azuchi Castle stood a huge hilltop castle that was walled in stone before Azuchi was even built.

BuiltRecord source: wikipedia