[4] From the late Heian or Kamakura period, they were one of several military families that had roots in the 11th century in Hizen Province on the island of Kyushu.

In 1580, he donated the area around Nagasaki Port to the Society of Jesus as an ecclesiastical territory, further solidifying the clan's ties to the Church.

However, although the Toyotomi regime confirmed him in the majority of his territories in northern Kyushu, it took the port of Nagasaki under direct control, and the clan lost its trade profits.

Yoshiaki fought on the side of the Eastern Army at the 1600 Battle of Sekigahara against the Toyotomi, and was reconfirmed in his holdings by the Tokugawa shogunate.

These vassals were not concentrated in the castle town, and approximately two-thirds of them resided in various villages rather than in Ōmura itself.

Ōmura Yoshiaki's son Sumiyori died suddenly at the age of 28 in 1619, and the clan was in danger of attainder as he had no heir.

Ōmura, which has a lot of terrain that is not suitable for paddy field cultivation, introduced sweet potatoes as a daily food ingredient in the first half of the 18th century, along with Satsuma Domain.

In 1867, Matsubayashi Iiyama, the leader of the Reformist Alliance, was assassinated, and Hario Kuzaemon was seriously injured.

Afterwards, along with Satsuma and Chōshū, Ōmura played an active role as one of the central clans in the overthrow of the shogunate.

However, due to the Tokugawa shogunate's banning of the Christian religion and increasingly draconian punishments for remaining believers, Ōmura Yoshiaki apostatised,[12] and ordered the construction of this temple in 1605.