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Kuroshima is an island located southeast of Hirado, off the coast of Sasebo. Many people came and settled here in the 18th century.
In September 1865, following the Discovery of the Hidden Christians at Nagasaki’s Oura Cathedral in March of the same year, Father Petitjean (the priest to whom they had confessed their faith) visited Sotome and successfully made contact with Hidden Christians living there.
Oura Cathedral is dedicated to the 26 martyrs of Japan, and was also the stage for an event which became known as the “Discovery of Christians”.