In 1657, the era of Suminaga OMURA, the 4th lord of the domain, a large number of crypto-Christians were exposed and arrested in three villages in a rural district in a northern part of the castle town.
第4代藩主・大村純長時代の明暦3年（1657年）、城下北部の郡村3村より多数の隠れキリシタンが発覚し逮捕されるに至った。