Question: When did the place of death of the author of Quadragesimo Anno become its own country?

Knowledge 1: Quadragesimo anno
Quadragesimo anno (Latin for "In the 40th Year") is an encyclical issued by Pope Pius XI on 15 May 1931, 40 years after Leo XIII's encyclical "Rerum novarum," further developing Catholic social teaching. Unlike Leo XIII, who addressed the condition of workers, Pius XI discusses the ethical implications of the social and economic order. He describes the major dangers for human freedom and dignity arising from unrestrained capitalism, socialism, and totalitarian communism. He also calls for the reconstruction of the social order based on the principles of solidarity and subsidiarity. [SEP] Knowledge 2: Flag of Vatican City
The flag of Vatican City was adopted on June 7, 1929, the year Pope Pius XI signed the Lateran Treaty with Italy, creating a new independent state governed by the Holy See. The Vatican flag is modeled on the 1808 yellow and white flag of the earlier Papal States, to which a papal tiara and keys were later added. The Vatican (and the Holy See) also refer to it, interchangeably, as the flag of the Holy See. [SEP] Knowledge 3: Vatican City
The name Vatican city was first used in the Lateran Treaty, signed on 11 February 1929, which established the modern city - state. The name is taken from Vatican Hill, the geographic location of the state. ``Vatican ''is derived from the name of an Etruscan settlement, Vatica or Vaticum meaning garden, located in the general area the Romans called vaticanus ager,`` Vatican territory''.
Knowledge 1: Quadragesimo anno
Quadragesimo anno (Latin for "In the 40th Year") is an encyclical issued by Pope Pius XI on 15 May 1931, 40 years after Leo XIII's encyclical "Rerum novarum," further developing Catholic social teaching. Unlike Leo XIII, who addressed the condition of workers, Pius XI discusses the ethical implications of the social and economic order. He describes the major dangers for human freedom and dignity arising from unrestrained capitalism, socialism, and totalitarian communism. He also calls for the reconstruction of the social order based on the principles of solidarity and subsidiarity. [SEP] Knowledge 2: Flag of Vatican City
The flag of Vatican City was adopted on June 7, 1929, the year Pope Pius XI signed the Lateran Treaty with Italy, creating a new independent state governed by the Holy See. The Vatican flag is modeled on the 1808 yellow and white flag of the earlier Papal States, to which a papal tiara and keys were later added. The Vatican (and the Holy See) also refer to it, interchangeably, as the flag of the Holy See. [SEP] Knowledge 3: The Turn of the Screw
On Christmas Eve, an unnamed narrator listens to Douglas, a friend, read a manuscript written by a former governess whom Douglas claims to have known and who is now dead. The manuscript tells the story of how the young governess is hired by a man who has become responsible for his young nephew and niece after the deaths of their parents. He lives mainly in London but also has a country house, Bly. He is uninterested in raising the children.
Knowledge 1: Quadragesimo anno
Quadragesimo anno (Latin for "In the 40th Year") is an encyclical issued by Pope Pius XI on 15 May 1931, 40 years after Leo XIII's encyclical "Rerum novarum," further developing Catholic social teaching. Unlike Leo XIII, who addressed the condition of workers, Pius XI discusses the ethical implications of the social and economic order. He describes the major dangers for human freedom and dignity arising from unrestrained capitalism, socialism, and totalitarian communism. He also calls for the reconstruction of the social order based on the principles of solidarity and subsidiarity. [SEP] Knowledge 2: Flag of Vatican City
The flag of Vatican City was adopted on June 7, 1929, the year Pope Pius XI signed the Lateran Treaty with Italy, creating a new independent state governed by the Holy See. The Vatican flag is modeled on the 1808 yellow and white flag of the earlier Papal States, to which a papal tiara and keys were later added. The Vatican (and the Holy See) also refer to it, interchangeably, as the flag of the Holy See. [SEP] Knowledge 3: Friedrich Christian, Margrave of Meissen
Albert Leopold Friedrich Christian Sylvester Anno Macarius, Prince of Saxony, Duke of Saxony, Margrave of Meissen (31 December 1893 – 9 August 1968) was the second son of Frederick Augustus III, the last reigning king of Saxony before the abolition of the monarchy in 1918. Upon his father's death in 1932, he became the head of the Royal House of Saxony. He was Captain à la suite in the Royal Bulgarian Infantry, and Grand Master of the Order of the Rue Crown, and also a Knight in the Order of the Black Eagle and Knight Grand Cross in the Sovereign Military Order of Malta. As head of the House of Wettin after 1932, he styled himself as "Friedrich Christian, Margrave of Meissen".

Answer: 11 February 1929