01 / The Mera clan and Ogawa Castle site
Without an Edo residence, the Mera clanwent to Edo in principle every five years.

The Mera clan, who held the Mera mountain domain as kotai-yoriai (交代寄合), had no Edo residence of their own and lodged at the Hitoyoshi domain's Edo residence during their stays. Their "duty" was managing the hawk-nest mountains. The site of their castle, Ogawa Castle (小川城), is now Ogawa Castle Site Park, where the Ogawa Folk Museum (小川民俗資料館) displays 330 items, including old farm tools and household goods.
- No Edo residence; lodged at Hitoyoshi domain's
- Edo visits in principle once every five years
- Ogawa Folk Museum: 330 items

