Question: On what date did the Governor of the place of death of Princeps Pastorum's author end?

<P0-S0> yang meng was the third son of yang xingmi, a major warlord at the end of tang dynasty as the military governor ("jiedushi") of huainan circuit (淮南, headquartered in modern yangzhou, jiangsu). <P0-S1> it is not known when he was born, although his immediately older brother yang longyan was born in 897 and his immediately younger brother yang pu was born in 900, placing a timeframe on his birth date. <P0-S2> his mother's name was not recorded in history. <SEP> <P1-S0> 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. <P1-S1> 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> <P2-S0> the most commonly given starting point for the middle ages is 476, first used by bruni. <P2-S1> [a] for europe as a whole, 1500 is often considered to be the end of the middle ages, but there is no universally agreed upon end date. <P2-S2> depending on the context, events such as christopher columbus's first voyage to the americas in 1492, the conquest of constantinople by the turks in 1453, or the protestant reformation in 1517 are sometimes used. <P2-S3> english historians often use the battle of bosworth field in 1485 to mark the end of the period. <P2-S4> for spain, dates commonly used are the death of king ferdinand ii in 1516, the death of queen isabella i of castile in 1504, or the conquest of granada in 1492. historians from romance-speaking countries tend to divide the middle ages into two parts: an earlier "high" and later "low" period. <P2-S5> english-speaking historians, following their german counterparts, generally subdivide the middle ages into three intervals: "early", "high", and "late". <P2-S6> in the 19th century, the entire middle ages were often referred to as the "dark ages",[b] but with the adoption of these subdivisions, use of this term was restricted to the early middle ages, at least among historians. <SEP> <P3-S0> Their canonizations were held on 27 April 2014. <P3-S1> 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. <P3-S2> The date of the canonization was assigned on 30 September 2013. <P3-S3> 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). <SEP> <P4-S0> It is derived from a biblical passage: I Peter 5:4. <P4-S1> In its English translation the letter opens with the phrase "On the day when "the Prince of the shepherds" entrusted to Us His lambs and sheep". <P4-S2> Princeps pastorum (Latin for 'Prince of the shepherds') is the title of an encyclical letter promulgated by Pope John XXIII on 28 November 1959. <P4-S3> It refers to Jesus Christ.