Question: When was the end date for the position of Governor of the place where the author of Mater et Magistra died?

Knowledge 1: Mater et magistra
Mater et magistra is the encyclical written by Pope John XXIII on the topic of "Christianity and Social Progress". It was promulgated on 15 May 1961. The title means "mother and teacher", referring to the role of the church. It describes a necessity to work towards authentic community in order to promote human dignity. It taught that the state must sometimes intervene in matters of health care, education, and housing. [SEP] Knowledge 2: Canonization of Pope John XXIII and Pope John Paul II
Pope John XXIII (25 November 1881 – 3 June 1963) and Pope John Paul II (18 May 1920 – 2 April 2005) reigned as popes of the Roman Catholic Church and the sovereigns of Vatican City (respectively from 1958 to 1963 and 1978 to 2005). Their canonizations were held on 27 April 2014. The decision to canonize was made official by Pope Francis on 5 July 2013 following the recognition of a miracle attributed to the intercession of John Paul II, while John XXIII was canonized for his merits of opening the Second Vatican Council. The date of the canonization was assigned on 30 September 2013. [SEP] Knowledge 3: Governor of Vatican City
The post of Governor of Vatican City (Governatore dello Stato della Città del Vaticano in Italian) was held by Marchese Camillo Serafini from the foundation of the state in 1929 until his death in 1952. No successor was appointed, and the post itself was not mentioned in the Fundamental Law of Vatican City State issued by Pope John Paul II on 26 November 2000, which entered into force on 22 February 2001.
Knowledge 1: Canonization of Pope John XXIII and Pope John Paul II
Pope John XXIII (25 November 1881 – 3 June 1963) and Pope John Paul II (18 May 1920 – 2 April 2005) reigned as popes of the Roman Catholic Church and the sovereigns of Vatican City (respectively from 1958 to 1963 and 1978 to 2005). Their canonizations were held on 27 April 2014. The decision to canonize was made official by Pope Francis on 5 July 2013 following the recognition of a miracle attributed to the intercession of John Paul II, while John XXIII was canonized for his merits of opening the Second Vatican Council. The date of the canonization was assigned on 30 September 2013. [SEP] Knowledge 2: Governor of Vatican City
The post of Governor of Vatican City (Governatore dello Stato della Città del Vaticano in Italian) was held by Marchese Camillo Serafini from the foundation of the state in 1929 until his death in 1952. No successor was appointed, and the post itself was not mentioned in the Fundamental Law of Vatican City State issued by Pope John Paul II on 26 November 2000, which entered into force on 22 February 2001. [SEP] Knowledge 3: Mater et magistra
Mater et magistra is the encyclical written by Pope John XXIII on the topic of "Christianity and Social Progress". It was promulgated on 15 May 1961. The title means "mother and teacher", referring to the role of the church. It describes a necessity to work towards authentic community in order to promote human dignity. It taught that the state must sometimes intervene in matters of health care, education, and housing.
Knowledge 1: Canonization of Pope John XXIII and Pope John Paul II
Pope John XXIII (25 November 1881 – 3 June 1963) and Pope John Paul II (18 May 1920 – 2 April 2005) reigned as popes of the Roman Catholic Church and the sovereigns of Vatican City (respectively from 1958 to 1963 and 1978 to 2005). Their canonizations were held on 27 April 2014. The decision to canonize was made official by Pope Francis on 5 July 2013 following the recognition of a miracle attributed to the intercession of John Paul II, while John XXIII was canonized for his merits of opening the Second Vatican Council. The date of the canonization was assigned on 30 September 2013. [SEP] Knowledge 2: Governor of Vatican City
The post of Governor of Vatican City (Governatore dello Stato della Città del Vaticano in Italian) was held by Marchese Camillo Serafini from the foundation of the state in 1929 until his death in 1952. No successor was appointed, and the post itself was not mentioned in the Fundamental Law of Vatican City State issued by Pope John Paul II on 26 November 2000, which entered into force on 22 February 2001. [SEP] Knowledge 3: Song of Songs
The Song offers no clue to its author or to the date, place, or circumstances of its composition. The superscription states that it is ``Solomon's '', but even if this is meant to identify the author, it can not be read as strictly as a similar modern statement. The most reliable evidence for its date is its language: Aramaic gradually replaced Hebrew after the end of the Babylonian exile in the late 6th century BCE, and the evidence of vocabulary, morphology, idiom and syntax clearly points to a late date, centuries after King Solomon to whom it is traditionally attributed. It has parallels with Mesopotamian and Egyptian love poetry from the first half of the 1st millennium, and with the pastoral idylls of Theocritus, a Greek poet who wrote in the first half of the 3rd century; as a result of these conflicting signs, speculation ranges from the 10th to the 2nd centuries BCE, with the language supporting a date around the 3rd century.

Answer: 1952