28/12/2025
This past Christmas felt a little like stepping back in time for me, because I got to visit a familiar place: .
in my memories
If anyone has ever strolled around Bangrak and looked toward the Chao Phraya River, you might have seen a large Western-style building standing majestically. That is Assumption Cathedral, an old Catholic church that I’m excited to tell you about. This place is not just an ordinary church—it’s like the heart of Catholic Christians in Thailand. It’s also the school I once attended.
A humble beginning by the Chao Phraya
Almost 200 years ago, Bangrak was a bustling commercial district with both foreigners and Siamese living together. Particularly, Westerners who practiced Christianity.
The priests who came to spread Christianity in Siam were from the Missions Étrangères de Paris (MEP), a French missionary society, which played a crucial role in introducing Roman Catholicism to Thailand.
Father Pascal, a descendant of Thai-Portuguese lineage (ordained in 1805), collected 1,500 baht from Christian villagers and his relatives. He gave this money to Father Florens to build a church, and they purchased a plot of land for 250 baht. This land was along the river, opposite the Santa Cruz Church, slightly above the small Gismatic Church (today’s Kallawar Temple).
In 1820, Bishop Florens bought the entire area (a banana garden) — from the seminary land of the mission to the riverbank. The seminary land is now the site of Assumption College (boys), and the second plot purchased in 1820 became the site of the current Assumption Cathedral, the parish school (Assumption Suksa), the Assumption Convent run by the Sisters of St. Paul de Chartres, the Archdiocese Office, a Catholic center, East Asiatic Company, Christian houses, and more.
Around 1821, the MEP built the first simple Assumption Church to hold religious ceremonies and serve as a community center for Christians in Bangrak. This marked the beginning of what would become Assumption Cathedral.
From a small church to an important center
As time passed, the number of Catholics in Bangkok grew, and the original church became too small. During the reigns of King Rama IV and V, the Catholic Church in Siam became more established, and plans were made to build a larger, more permanent cathedral.
Construction of the current Assumption Cathedral began around 1909 (under Father Colombet) and was completed around 1919, taking several years. It became both a historically and spiritually significant building for Catholics.
The cathedral’s architecture is distinctly Western. A key feature is the twin bell towers at the front. The overall structure is long, strong, and elegant. Inside, it has high arched ceilings, evenly spaced columns, and stained glass windows imported from Europe, depicting stories from the Bible. When sunlight passes through these windows, it creates a peaceful and sacred atmosphere.
(Note: the cathedral does not have a dome—people may sometimes confuse the arched ceiling inside with a dome.)
The name “Assumption” refers to the belief in the Assumption of Mary, that Mary was taken up into heaven body and soul—a core faith of Catholics, reflected in the cathedral’s artwork.
Assumption Cathedral is not only important for religious purposes but also serves as the administrative center of the Catholic Church in Thailand. It is the seat of the Archbishop and the starting point for many educational and medical institutions, such as Assumption College and Saint Louis Hospital. It stands as evidence of the MEP’s role in spreading Christianity in Thai society and the harmonious coexistence of people from different cultures.
Assumption Cathedral today
Even after more than a hundred years, Assumption Cathedral, Bangrak, remains a spiritual center for Catholics, a place for major ceremonies, and a historical treasure of Bangkok. Anyone visiting can feel the calm and sense the stories passed down through generations.
