Context: The era of mass persecution and execution of heretics under the banner of Christianity came to an end in 1826 with the last execution of a "heretic", Cayetano Ripoll, by the Catholic Inquisition.

Question: What year did the deaths of heretics under Christianity come to an end?
Answer: 1826

Question: Who was the last heretic put to death under the Catholic Inquisition?
Answer: Cayetano Ripoll

Question: What ended in the 18th century?
Answer: Unanswerable

Question: Who was the last Catholic executed?
Answer: Unanswerable