Tam Toa Parish has a long history, originating from Dong Hai Parish – one of the first Catholic communities in Vietnam, established around the 17th century. This is considered an important foundation for the later development of the parish in the Dong Hoi area.
During the period of 1886–1887, Tam Toa Church was officially built at its current location after parishioners moved from the Phu Hai area following the attack by the Van Than forces in 1886. The building features European Gothic architecture influenced by Portuguese architecture, with high arched ceilings, a prominent bell tower, and a solemn space. At that time, the church was considered one of the most beautiful religious buildings in Vietnam.
In 1940, Father René Morineau (commonly known as Co Trung) renovated and expanded the church, making the structure more spacious and imposing. Before 1954, this was a vibrant religious activity center for over 1,200 parishioners in the region. After the 1954 Geneva Accords, the majority of Tam Toa parishioners migrated to the South and established the new Tam Toa parish in Da Nang, marking an important turning point in the community's history.

Photo: Intact historical value at the old Tam Toa Church relic