Context: Maintaining continuity with his predecessors, John XXIII continued the gradual reform of the Roman liturgy, and published changes that resulted in the 1962 Roman Missal, the last typical edition containing the Tridentine Mass established in 1570 by Pope Pius V at the request of the Council of Trent and whose continued use Pope Benedict XVI authorized in 2007, under the conditions indicated in his motu proprio Summorum Pontificum. In response to the directives of the Second Vatican Council, later editions of the Roman Missal present the 1970 form of the Roman Rite.

Question: John XXIII continued the gradual reform of what?
Answer: the Roman liturgy

Question: He published changes that resulted in what?
Answer: the 1962 Roman Missal

Question: What did Pope Pius V establish in 1570?
Answer: the Tridentine Mass

Question: Pope Benedict XVI authorized continued use of the Roman Missal in what year?
Answer: 2007

Question: When was the Roman Rite created?
Answer: 1970

Question: What did Pope Benedict XVI continue the gradual reform of?
Answer: Unanswerable

Question: What did the changes published by Pope Benedict XVI cause?
Answer: Unanswerable

Question: What did Pope John XXIII establish in 1570?
Answer: Unanswerable

Question: Why did Pope John XXIII establish the Tridentine Mass?
Answer: Unanswerable

Question: What did Pope Pius V continue to authorize the use of in 2007?
Answer: Unanswerable