After Ahatallah's death representatives of the Thomas Christians came together at the Church of Our Lady in Mattancherry and swore the Coonan Cross Oath, in which they vowed they would never again submit to the Portuguese.
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His mysterious appearance in, and disappearance from, Portuguese India caused a great uproar there, and resulted directly in a revolt by the Saint Thomas Christians against Portuguese rule and the establishment of an independent Malankara Church.