Japan Castle Atlas

Kobayakawa Hideaki

小早川秀秋

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

Connected castles

Okayama

岡山城

Look at the foot of the black keep and you'll see its base is not square but a lopsided pentagon.

Rebuilt / expandedRecord source: wikipedia

Fukuoka

名島城

ぱちょぴ（投稿者）による撮影CC BY-SA 3.0Wikimedia Commons

LordRecord source: wikipedia