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I believe this is incorrect -- the Chaleans deny that their theology is Nestorian. They say that they sheltered Nestorius in the Persian Empire, but their theology is from their Catholicos Babai the Great.

I'm inclined to believe them as I personally believe that Nestorius faltered due to a slip in language and he stuck to the orthodox faith.

In any case, the Chaldean/Assyrian/Ancient Church of the East was vast in it's day -- it had converts as far as India and Mongolia

One of the Mongol tribes, the Naiman, were Chaldean Christians and remained so until the 15th century when they became Muslim and were subsumed into the Kazakh Turkic identity. The Nestorian wife of Hulagu Khan the grandson of GEnghis Khan moved him to destroying Baghdad in the 13th century AD

The Assyrian Church also has had the most martyrs as it's land was squarely in Muslim territory and it has been persecuted continuously -- initially it flourished in the Persian Empire while the Roman Empire persecuted Christianity, but when the Roman Empire became Christian and especially when a Roman Emperor wrote to the Shahenshah of Persia to look after the Christians in the Persian Empire, that caused the Zoroastrian persecution of Christians which lasted until the Muslim invasion. After the Muslim invasion, the Church flourished again for a while but then was persecuted once more under the Turkic rulers, had a reprieve under the Mongols and then was nearly destroyed by that blood-thirsty madman, Timur-i-lang (Tamerlane or Timur the lame).