Exploring Yuzuki Castle: A Medieval “Earthwork Castle” of the Kono Clan Near Dogo Onsen | Japan’s Top 100 Castles #80

1. Quick Facts: What to Know Before You Go

2. [Field Report] Strategy Points & Dad’s Analysis

Deep History Found in the Name “Yuzuki”

I made an interesting discovery during this mission. While it’s officially written as “湯築城” (Yuzuki), it appears as “湯月城” in records at Ozu Castle, and some documents refer to it as “湯付城.”

Personally, considering it sits right next to Dogo Onsen, the kanji for “Yuzuki” (湯付—meaning a place attached to hot springs) feels the most intuitive. The variety of names is a testament to how this site has been cherished as a local symbol throughout the ages. Unlike the stone-walled castles of later periods, the depth of this “Earthwork Castle” (Tsuchi-no-Shiro) really sparked my intellectual curiosity this morning.

Even the Guide was Shocked! Learning the “Iyo Navy” Legacy with Keigo

At the information center, a volunteer guide gave us a warm welcome. That’s when my son Keigo’s knowledge exploded. As the guide was explaining the history, Keigo chimed in with the term “Murakami Suigun” (the famous Murakami Pirate Navy). The guide’s eyes went wide—”You sure know your history!”

We revisited the history of the Kono clan, who led the naval forces through the rough waves of the Seto Inland Sea under the “Oshiki ni Sanmonji” family crest. Seeing that the pride of this prestigious clan—who fought on the front lines during the Genpei War and the Mongol Invasions—resonated with my 8-year-old son was a truly moving moment for me as a father.

3. Family & Kid-Friendly Guide

• Keigo’s Reaction (Age 8): He borrowed a helmet (kabuto) and sword at the information center and was in full “Samurai Mode” for photos. He loved chatting with the friendly guide and held onto his handmade origami helmet with great care.
• Dad’s Advice: Since there are no high stone walls or a central keep (Tenshu), it might look like “just a park” at first glance. I recommend a quick study of the Kono clan and their naval history beforehand; it makes the defensive brilliance of the double moats and earthworks much clearer. Access is great, but check the museum hours before you go!

4. Castle Souvenirs & Lunch

• What we bought: Wooden Castle Seal (Goshuin). Different from the usual paper seals, the texture and warmth of the wood perfectly match the “Earthwork Castle” vibe of Yuzuki. The handmade origami helmet was also a fantastic souvenir for the kids.

5. Nearby Recommendations

• Dogo Onsen Honkan: Located just a stone’s throw away. We only viewed the exterior this time, but its historic atmosphere feels like a direct continuation of Yuzuki Castle’s timeline.

• Botchan Train: If your timing is right, you can see these retro train cars near Dogo Onsen Station. A must-see for any young train enthusiast!

• Matsuyama Castle: After enjoying the “Earthwork Castle,” take the ropeway up to see the “Stone-walled Castle.” It’s a luxury to compare medieval and early-modern defense logic in a single day.