Problem: In 1165 Maimonides visited Jerusalem and prayed on the Temple Mount, in the "great, holy house". In 1141 Spanish-Jewish poet, Yehuda Halevi, issued a call to the Jews to emigrate to the Land of Israel, a journey he undertook himself. In 1187 Sultan Saladin, founder of the Ayyubid dynasty, defeated the Crusaders in the Battle of Hattin and subsequently captured Jerusalem and almost all of Palestine. In time, Saladin issued a proclamation inviting Jews to return and settle in Jerusalem, and according to Judah al-Harizi, they did: "From the day the Arabs took Jerusalem, the Israelites inhabited it." Al-Harizi compared Saladin's decree allowing Jews to re-establish themselves in Jerusalem to the one issued by the Persian king Cyrus the Great over 1,600 years earlier.
Who was the founder of the Ayyubid dynasty?
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Answer: Sultan Saladin

Problem: The largest opera houses of Paris are the 19th-century Opera Garnier (historical Paris Opera) and modern Opera Bastille; the former tends toward the more classic ballets and operas, and the latter provides a mixed repertoire of classic and modern. In middle of the 19th century, there were three other active and competing opera houses: the Opera-Comique (which still exists), Theatre-Italien, and Theatre Lyrique (which in modern times changed its profile and name to Theatre de la Ville). Philharmonie de Paris, the modern symphonic concert hall of Paris, opened in January 2015. Another musical landmark is the Theatre des Champs-Elysees, where the first performances of Diaghilev's Ballets Russes took place in 1913.
When did Philharmonie de Paris open?
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Answer: January 2015

Problem: On December 30, 1922, the First Congress of the Soviets of the USSR approved the Treaty on the Creation of the USSR, by which Russia was united with the Ukrainian Soviet Socialist Republic, Byelorussian Soviet Socialist Republic, and Transcaucasian Soviet Federal Socialist Republic into a single federal state, the Soviet Union. Later treaty was included in the 1924 Soviet Constitution,[clarification needed] adopted on January 31, 1924 by the Second Congress of Soviets of the USSR.
On what date was the 1924 Soviet Constitution adopted?
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Answer:
January 31, 1924