I looked them up.
malankaraorthodoxchurch.in/ I see what you mean about trying to give details…seems like there are big gaps in their timeline
Are you looking at the same timeline as I am on that website? Because here’s what it says about their Church:
*"The Malankara Orthodox Syrian Church was founded by St. Thomas, one of the twelve apostles of Jesus Christ, who came to India in A.D. 52.
At least from the fourth century the Indian Church entered into a close relationship with the Persian or East Syrian Church. From the Persians, the Indians inherited East Syrian language and liturgies and gradually came to be known as Syrian Christians.
In the sixteenth century Roman Catholic missionaries came to Kerala. They tried to unite the Syrian Christians to the Roman Catholic Church and this led to a split in the community. Those who accepted Catholicism are the present Syro-Malabar Catholics. Later Western Protestant missionaries came to Kerala and worked among Syrian Christians; That also created certain splits in the community.
In the seventeenth century the Church came to a relationship with the Antiochene Church which again caused splits. As a result of this relationship the Church received West Syrian liturgies and practices.
The Church entered into a new phase of its history by the establishment of the Catholicate in 1912.
At present the Church is using the West Syrian liturgy. The faith of the Church is that which was established by the three Ecumenical Councils of Nicea (A.D. 325), Constantinople (A.D. 381) and Ephesus (A.D. 431).
The Church is in communion with the other Oriental Orthodox Churches namely, Antiochene, Alexandrian, Armenian, Eritrean and Ethiopian Orthodox Churches"*
I have HH Mor Ignatius Aphram Barsoum’s “History of the Syriac Dioceses” which covers the period of 1687-1774 (HH Mor Ignatius Jirjis II to HG Gregorius Anton, Bishop of Gargar). I may have overlooked something before this date, but India appears to be first mentioned in the entry on Metropolitan Iyawannis Yuhanna “The Iconoclast” (1740-1755), who was entrusted with the care of the diocese of Malabar c.1746 by HH Mor Ignatius Jirjis III, Syriac Orthodox at the time, so they must’ve had some preexisting relationship with the Syriac people of Malabar (though what exactly it was remains unclear; the Malankara Orthodox people I’ve talked to, anyway, seem to tie their relationship to the SOC back to events that happened in the wake of the Coonan Cross Oath, which occurred in 1653; it’s not unreasonable, though HH’s history does not make that claim). This matches what the Malankara Orthodox history says above.
It looks like they embraced Nestorianism in their timeline and have remained that way.
What? What are you basing this conclusion on? We do not allow Nestorians in our communion, heaven forbid. The Malankara Orthodox are in no way Nestorian, despite the East Syriac connections of the Syriac Christians in India. They are of the same confession as the rest of the OO, as they are in communion with us.
They observe the 1st 3 Councils only
As do all OO. The Nestorians observe only the first two councils.
It also looks like this church had its own internal schisms particularly in the 16th and 17th centuries. 1/2 of them broke off from the Malankara in the 17th century, and united with Rome, becoming Chaldean rite. …is that how you read it? Am I understanding this correctly about the Malankara being Nestorian
No, you’re not. A very simplified history would paint the Syriac Indians as part of the East Syriac world from some indeterminate point until the Portuguese showed up at some point in the 1500s or thereabouts and started messing with their ways doing things (Portuguese India began in 1505, though since the Coonan Cross Oath didn’t happen until near the mid-15th century, I don’t know what they were doing before that). As a result, some who had previously been East Syriac/Nestorian came into union with the Syriac Orthodox Church, though there was apparently some kind of preexisting relationship there for HH Patriarch Mor Ignatius Jirjis III to be sending people to oversee the diocese of Malabar. Syriac Orthodox Indian acquaintances of mine have said that there are ancient inscriptions in Goa dating from roughly the 6th century that talk about “Yoldath Aloho” (the Theotokos), which is not a term that Nestorians would ever use, so perhaps there was some preexisting Syriac Orthodox presence that had since been forgotten or willfully abandoned or something (the SOC had dioceses in a lot of places we now consider basically entirely “East Syriac”, like various places in Persia proper, up until around the 16th century, so it’s not unimaginable that East Syriac people could be Orthodox even before this time; you certainly find a lot more videos on YT for Malankara Orthodox liturgies searching in East Syriac than you do in West Syriac, anyway, and isn’t that the most scientific measurement of anything?

). We’ll probably never know the real story, given the sad factionalism that plagues the Indian Christians overall (related to issues of autocephaly, history, territorial claims, etc). At any rate, the point is that the Malankara Syriacs have been allied with the West Syriac world ever since the 16th century, using the West Syriac liturgy in common with the SOC, and holding to all the beliefs of the other OO churches, including a very stern stance against Nestorianism.