Question: When did the Governorship end of the city that contains the basilica named after the saint who was the apostle that was crucified upside down?

Knowledge 1: Saint Peter
According to Christian tradition, Peter was crucified in Rome under Emperor Nero Augustus Caesar. It is traditionally held that he was crucified upside down at his own request, since he saw himself unworthy to be crucified in the same way as Jesus. Tradition holds that he was crucified at the site of the Clementine Chapel. His remains are said to be those contained in the underground Confessio of St. Peter's Basilica, where Pope Paul VI announced in 1968 the excavated discovery of a first - century Roman cemetery. Every 29 June since 1736, a statue of Saint Peter in St. Peter's Basilica is adorned with papal tiara, ring of the fisherman, and papal vestments, as part of the celebration of the Feast of Saints Peter and Paul. According to Catholic doctrine, the direct papal successor to Saint Peter is the incumbent pope, currently Pope Francis. [SEP] Knowledge 2: Dedication of Saints Peter and Paul
The Dedication of the Basilicas of the Apostles Peter and Paul is a feast day on the liturgical calendar of the Catholic Church, which is celebrated on 18 November. [SEP] Knowledge 3: Mosaic
In the following century Ravenna, the capital of the Western Roman Empire, became the center of late Roman mosaic art (see details in Ravenna section). Milan also served as the capital of the western empire in the 4th century. In the St Aquilinus Chapel of the Basilica of San Lorenzo, mosaics executed in the late 4th and early 5th centuries depict Christ with the Apostles and the Abduction of Elijah; these mosaics are outstanding for their bright colors, naturalism and adherence to the classical canons of order and proportion. The surviving apse mosaic of the Basilica of Sant'Ambrogio, which shows Christ enthroned between Saint Gervasius and Saint Protasius and angels before a golden background date back to the 5th and to the 8th century, although it was restored many times later. The baptistery of the basilica, which was demolished in the 15th century, had a vault covered with gold-leaf tesserae, large quantities of which were found when the site was excavated. In the small shrine of San Vittore in ciel d'oro, now a chapel of Sant'Ambrogio, every surface is covered with mosaics from the second half of the 5th century. Saint Victor is depicted in the center of the golden dome, while figures of saints are shown on the walls before a blue background. The low spandrels give space for the symbols of the four Evangelists.
Knowledge 1: Saint Peter
According to Christian tradition, Peter was crucified in Rome under Emperor Nero Augustus Caesar. It is traditionally held that he was crucified upside down at his own request, since he saw himself unworthy to be crucified in the same way as Jesus. Tradition holds that he was crucified at the site of the Clementine Chapel. His remains are said to be those contained in the underground Confessio of St. Peter's Basilica, where Pope Paul VI announced in 1968 the excavated discovery of a first - century Roman cemetery. Every 29 June since 1736, a statue of Saint Peter in St. Peter's Basilica is adorned with papal tiara, ring of the fisherman, and papal vestments, as part of the celebration of the Feast of Saints Peter and Paul. According to Catholic doctrine, the direct papal successor to Saint Peter is the incumbent pope, currently Pope Francis. [SEP] Knowledge 2: Dedication of Saints Peter and Paul
The Dedication of the Basilicas of the Apostles Peter and Paul is a feast day on the liturgical calendar of the Catholic Church, which is celebrated on 18 November. [SEP] Knowledge 3: St. Peter's Basilica
The Papal Basilica of St. Peter in the Vatican (Italian: Basilica Papale di San Pietro in Vaticano), or simply St. Peter's Basilica (Latin: Basilica Sancti Petri), is an Italian Renaissance church in Vatican City, the papal enclave within the city of Rome.
Knowledge 1: Saint Peter
According to Christian tradition, Peter was crucified in Rome under Emperor Nero Augustus Caesar. It is traditionally held that he was crucified upside down at his own request, since he saw himself unworthy to be crucified in the same way as Jesus. Tradition holds that he was crucified at the site of the Clementine Chapel. His remains are said to be those contained in the underground Confessio of St. Peter's Basilica, where Pope Paul VI announced in 1968 the excavated discovery of a first - century Roman cemetery. Every 29 June since 1736, a statue of Saint Peter in St. Peter's Basilica is adorned with papal tiara, ring of the fisherman, and papal vestments, as part of the celebration of the Feast of Saints Peter and Paul. According to Catholic doctrine, the direct papal successor to Saint Peter is the incumbent pope, currently Pope Francis. [SEP] Knowledge 2: St. Peter's Basilica
The Papal Basilica of St. Peter in the Vatican (Italian: Basilica Papale di San Pietro in Vaticano), or simply St. Peter's Basilica (Latin: Basilica Sancti Petri), is an Italian Renaissance church in Vatican City, the papal enclave within the city of Rome. [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.

Answer: 1952