Context: During the Western Schism, many cardinals were created by the contending popes. Beginning with the reign of Pope Martin V, cardinals were created without publishing their names until later, termed creati et reservati in pectore.

Question: Which pope began using creati et reservati in pectore?
Answer: Pope Martin V

Question: How were many Cardinals created during the Eastern Schism>?
Answer: Unanswerable

Question: What was published during the reign of Pope Martin V?
Answer: Unanswerable

Question: What did Pope Pious V begin using?
Answer: Unanswerable

Question: What position was not being contended during the Western Schism?
Answer: Unanswerable