In this task, you're given a passage, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.

Passage: The Solemnity of Our Lord Jesus Christ, King of the Universe, commonly referred to as the Feast of Christ the King or Christ the King Sunday, is a relatively recent addition to the Western liturgical calendar, having been instituted in 1925 by Pope Pius XI for the Roman Catholic Church. In 1970 its Roman Catholic observance was moved to the final Sunday of Ordinary Time. Therefore, the earliest date on which it can occur is 20 November and the latest is 26 November. The Anglican, Lutheran, and many other Protestant churches also celebrate the Feast of Christ the King, which is contained in the Revised Common Lectionary. Roman Catholics adhering to the Extraordinary Form of the Roman Rite use the General Roman Calendar of 1960, and as such continue to observe the Solemnity on its original date of the final Sunday of October. It is also observed on the same computed date as the final Sunday of the ecclesiastical year, the Sunday before the First Sunday of Advent, by Western rite parishes of the Russian Orthodox Church Outside Russia. In 2019, the feast day is celebrated on 24 November.
 Link Information: having been instituted in 1925 by Pope Pius XI Question: How long had Pope Pius XI been serving as Pope for the year he instituted Christ the King Sunday?
Answer: 3