Early history Origin The old church in Udayamperoor is traditionally dated to the 6th century and is believed to have been established in 510 AD. Church historian Bernard Thoma states that it was founded by the then Villarvattom king. Subsequent history of the church is largely obscure. According to Saint Thomas Christian tradition,
Sabor and Aphroth, two 9th century Persian East Syriac bishops, rebuilt the church along with multiple other churches across Malabar coast. Local tradition says that when the town of Kodungallur was destroyed due to civil unrest, Sabor and Aproth, who were residing there, moved to Udayamperoor. For this reason, the 17th century Portuguese accounts such as the 'Jornada of Menezes' call it a former episcopal see.
Association with the Villarvattom dynasty By the 15th century, Udayamperoor definitely housed the headquarters of the
Villarvattom () () dynasty. Villarvattom is known for its association with the Saint Thomas Christian community, with traditions saying that it was indeed a Christian dynasty.
Thoma of Villarvattom, the last king to reign in the dynasty, is said to have died in 1502 and entombed in the Udayamperoor Church. A tombstone inscription documenting his death is preserved among many such funeral epitaphs in the Synodal Church. However, in the Travancore Archaeological Series, Ayyar has questioned the 16th century dating and instead provides 1701 as the accurate year in the inscription.
Under the Southists By the end of the 16th century, Udayamperoor church became one of the strongholds of the
Southists (Knanaya Christians) and was one among their five chief churches (others being
Kaduthuruthy (), Kottayam (), Thodupuzha () and Kallishery ()). They migrated to Udayamperoor after the fall of Kodungallur () to the Sāmutiri King in 1521. Northists (Non-Knanaya Saint Thomas Christians) and Southists did not intermarry and often clashed over parish administration. The church came under the exclusive control of the Southists with the support of the Portuguese. Therefore the Northists were forced to shift to the new parish which they had established in a nearby village called
Kandanad (). Francisco Roz documents the bitter rivalry between the Southists and Northists that often erupted as disputes between the two parishes. These disputes eventually spread to other churches which were under collective ownership such as Kaduthuruthy, Thodupuzha and Kottayam. This also forced the Southists to increasingly align themselves with the Portuguese who were in conflict with the larger Saint Thomas Christian community.
Synod of Udayamperoor In 1599, Udayamperoor church became the venue for the Synod convened by
Alexis Menezes, the Portuguese colonial Archbishop of Goa. The synod was originally expected to take place in
Angamaly, the archdiocesan headquarters. However Menezes disliked Angamaly as it was a stronghold of
Giwargis of Cross, the Saint Thomas Christian archdeacon, and as its ruler (
Alaṅṅāṭṭŭ Kaimaḷ) was not in good terms with the Portuguese. Hence, the venue was shifted to Udayamperoor where the large Southist population was friendly with the Portuguese missionaries. Menezes was also supported by the King of
Cochin who was in good terms with the Portuguese. The synod was convened following the death of
Metropolitan Abraham and was intended to terminate the their hierarchical relationship with the Chaldean Catholic Patriarchate and to bring them under the Portuguese rule. The Synod was held in June 1599 under presidency of Alexis de Menezes, as the culmination of their latinization efforts among the local Saint Thomas Christians. The Synod was attended by 153 priests and 671 representatives from 168 locations. Most of these were pro-Portuguese, and more than 100 of the priests who participated were ordained by Menezes himself. In preparation to the synod, he performed mass priestly ordinations in Udayamperoor, despite the strong protests of the archdeacon. The synod was held inside and around the church. Multiple priests celebrated Holy Qurbana on each side of the stone cross located in front of the church during the synod. It was this Synod that removed Sabor and Aproth as the parish saints of the church and rededicated it in the name of 'All Saints'. After the synod, a large part of the ancient documents preserved in the church, including the East Syriac liturgical texts, were destroyed under the leadership of Menezes.
Coonan Cross Oath and schism Udayamperoor Church was one of the few parishes that stood with the Portuguese when Archdeacon Thoma was proclaimed Metropolitan following the Coonan Cross Oath against Portuguese hegemony. After this incident, the pope sent Giuseppe Maria Sebastiani, a Carmelite priest, as Apostolic Vicar to Malabar inorder to resolve the division, and the majority of the Saint Thomas Christians joined him. Since then the Udayamperoor church came under the Vicariate of Malabar.
Later history Tipu's arsonage and Tharakan's reconstruction During the Malabar military campaign of the Mysore ruler
Tipu Sultan, the church was attacked and the roof was torn down. The remains of the market near the church were piled inside the church and burned, the facade of the church was demolished and cannons were installed there. This church building, which was on the verge of destruction, was rebuilt at the initiative of
Thachil Mathu Tharakan.
Financial despair The continuous disputes between the two factions also hindered the progress of the church. Church property was being encroached upon due to mishandling and the church was in financial despair. The church fell into a heavy financial debt and to resolve this, 12,000 chakram was borrowed from the
Angamaly Church in exchange for its Portuguese era church bell. This bell is now preserved in
Angamaly. In 1887, the pope permanently separated the Syro-Malabar Christians from the latin hierarchy and the Udayamperoor church was included in the
Apostolic vicariate of Kottayam. Due to financial difficulties, the church could not pay the one-fourth share of income to the vicariate. For this reason,
Charles Lavigne, the then Vicar apostolic, seized the golden chalice that was in the church and took it with him. It was returned to the church after
Wladyslav Zalesky's order at the request of an assembly held at
Kuravilangad.
Southists vacating the Church Gradually, conflicts between the Northists and Southists residing in Udayamperoor widened and the latter, who were relatively few in number, migrated from here to other places, such as Thodupuzha,
Piravom, Kaduthuruthy and
Vadavukode, over time. In 1896, the church was included in the newly established
Vicariate of Ernakulam. With the establishment of a
separate vicariate for the Knanaya Catholics in 1911 and the Udayamperoor church continuing within the Vicariate of Ernakulam, most of the Knanaya completely severed their ties with the Udayamperoor church. The few remaining Knanaya families in Udayamperoor were added to Karippadam parish, which was part of the Knanaya vicariate. ==Architecture==