Question: Who has been designated as the first emperor of the place where the creator of Annunciation of Cortona died?

full_context: Document 1: Fra Angelico: In 1445 Pope Eugene IV summoned him to Rome to paint the frescoes of the Chapel of the Holy Sacrament at St Peter's, later demolished by Pope Paul III. Vasari claims that at this time Fra Angelico was offered the Archbishopric of Florence by Pope Nicholas V, and that he refused it, recommending another friar for the position. The story seems possible and even likely. However, if Vasari's date is correct, then the pope must have been Eugene IV and not Nicholas, who was elected Pope only on 6 March 1447. Moreover, the archbishop in 1446–1459 was the Dominican Antoninus of Florence (Antonio Pierozzi), canonized by Pope Adrian VI in 1523. In 1447 Fra Angelico was in Orvieto with his pupil, Benozzo Gozzoli, executing works for the Cathedral. Among his other pupils were Zanobi Strozzi.
Document 2: Annunciation (Caravaggio): The Annunciation is an oil painting by the Italian master Michelangelo Merisi da Caravaggio, finished around 1608. It housed in the Musée des Beaux-Arts de Nancy.
Document 3: Vocation of the Apostles: The Vocation of the Apostles is a fresco by the Italian Renaissance painter Domenico Ghirlandaio, executed in 1481–1482 and located in the Sistine Chapel, Rome. It depicts the Gospel narrative of Jesus Christ calling Peter and Andrew to become his disciples.
Document 4: Roman Republic: The extensive campaigning abroad by Roman generals, and the rewarding of soldiers with plunder on these campaigns, led to a general trend of soldiers becoming increasingly loyal to their generals rather than to the state. Rome was also plagued by several slave uprisings during this period, in part because vast tracts of land had been given over to slave farming in which the slaves greatly outnumbered their Roman masters. In the 1st century BC at least twelve civil wars and rebellions occurred. This pattern continued until 27 BC, when Octavian (later Augustus) successfully challenged the Senate's authority, and was made princeps (first citizen).
Document 5: The Annunciation, with Saint Emidius: The Annunciation, with Saint Emidius is an altarpiece by Italian artist Carlo Crivelli showing an artistic adaptation of the Annunciation. The altarpiece was painted for the Church of SS. Annunziata in the Italian town of Ascoli Piceno, in the region of Marche, to celebrate the self-government granted to the town in 1482 by Pope Sixtus IV. The painting was removed to the Pinacoteca di Brera in Milan in 1811, but passed to Auguste-Louis de Sivry in 1820, and had reached England by the mid-19th century. It has been housed in the National Gallery in London since it was donated by Henry Labouchere, 1st Baron Taunton in 1864.
Document 6: The Entombment (Michelangelo): According to documents discovered in 1981, Michelangelo had been commissioned to paint a panel for the church of Sant'Agostino in Rome, but in the end gave back the sum received. It is probable that this work was the "Entombment", which remained unfinished upon Michelangelo's return to Florence.
Document 7: Ferraù Fenzoni: Ferraù Fenzoni was born in (Faenza) and arrived in Rome as a young man in the early 1580s. He was apprenticed in Rome during the papacy of Gregory XIII and worked on numerous fresco cycles under pope Sixtus V, such as the Loggia della Benedizioni in the Lateran Palace, the frescoes on the walls and vaults of the Scala Santa of the adjacent Basilica of San Giovanni in Laterano, and the decoration in the Sistine library.
Document 8: Cortona Triptych: The Cortona Triptych is a Catholic Church depiction of the Madonna and Child with saints, painted by Fra Angelico. It is now kept at the Diocesan Museum in Cortona, Italy. The painting dates from 1436-1437.
Document 9: Roman Republic: However, civil war flared again when the Second Triumvirate of Octavian, Lepidus and Mark Antony failed. The ambitious Octavian built a power base of patronage and then launched a campaign against Mark Antony. At the naval Battle of Actium off the coast of Greece, Octavian decisively defeated Antony and Cleopatra. Octavian was granted a series of special powers including sole "imperium" within the city of Rome, permanent consular powers and credit for every Roman military victory, since all future generals were assumed to be acting under his command. In 27 BC Octavian was granted the use of the names "Augustus" and "Princeps", indicating his primary status above all other Romans, and he adopted the title "Imperator Caesar" making him the first Roman Emperor.
Document 10: Annunciation of Cortona: The Annunciation of Cortona is a panel-painting altarpiece or retable by Fra Angelico: once housed in the Church of Gesù of Cortona, it is now held at the Museo Diocesano in Cortona.
Document 11: The Last Judgment (Fra Angelico, Florence): The Last Judgment (tempera on panel) is a painting by the Renaissance artist Fra Angelico. It was commissioned by the Camaldolese Order for the newly elected abbot, the humanist scholar Ambrogio Traversari. It is variously dated to c1425, 1425–30 and 1431. It was originally sited in the church of Santa Maria degli Angeli and now is in the museum of San Marco, Florence. It is not to be confused with another Fra Angelico "Last Judgement" in the Gemäldegalerie, Berlin.
Document 12: Roman Empire: The Roman Empire (Latin: Imperium Rōmānum, Classical Latin: (ɪmˈpɛ. ri. ũː roːˈmaː. nũː); Koine and Medieval Greek: Βασιλεία τῶν Ῥωμαίων, tr. Basileia tōn Rhōmaiōn) was the post-Roman Republic period of the ancient Roman civilization, with a government headed by emperors and large territorial holdings around the Mediterranean Sea in Europe, Africa and Asia. The city of Rome was the largest city in the world c. 100 BC -- c. AD 400, with Constantinople (New Rome) becoming the largest around AD 500, and the Empire's population grew to an estimated 50 to 90 million inhabitants (roughly 20% of the world's population at the time). The 500 - year - old republic which preceded it had been severely destabilized in a series of civil wars and political conflict, during which Julius Caesar was appointed as perpetual dictator and then assassinated in 44 BC. Civil wars and executions continued, culminating in the victory of Octavian, Caesar's adopted son, over Mark Antony and Cleopatra at the Battle of Actium in 31 BC and the annexation of Egypt. Octavian's power was then unassailable and in 27 BC the Roman Senate formally granted him overarching power and the new title Augustus, effectively marking the end of the Roman Republic.
Document 13: Annunciation (van Eyck, Washington): The Annunciation is an oil painting by the Early Netherlandish master Jan van Eyck, from around 1434–1436. The panel is housed in the National Gallery of Art, in Washington D.C. It was originally on panel but has been transferred to canvas. It is thought that it was the left (inner) wing of a triptych; there has been no sighting of the other wings since before 1817. The annunciation is a highly complex work, whose iconography is still debated by art historians.
Document 14: Roman Republic: After the assassination, Mark Antony formed an alliance with Caesar's adopted son and great-nephew, Gaius Octavian. Along with Marcus Lepidus, they formed an alliance known as the Second Triumvirate. They held powers that were nearly identical to the powers that Caesar had held under his constitution. As such, the Senate and assemblies remained powerless, even after Caesar had been assassinated. The conspirators were then defeated at the Battle of Philippi in 42 BC. Eventually, however, Antony and Octavian fought against each other in one last battle. Antony was defeated in the naval Battle of Actium in 31 BC, and he committed suicide with his lover, Cleopatra. In 29 BC, Octavian returned to Rome as the unchallenged master of the Empire and later accepted the title of Augustus ("Exalted One"). He was convinced that only a single strong ruler could restore order in Rome.
Document 15: Roman Republic: Caesar was now the primary figure of the Roman state, enforcing and entrenching his powers. His enemies feared that he had ambitions to become an autocratic ruler. Arguing that the Roman Republic was in danger, a group of senators hatched a conspiracy and assassinated Caesar at a meeting of the Senate in March 44 BC.  Mark Antony, Caesar's lieutenant, condemned Caesar's assassination, and war broke out between the two factions. Antony was denounced as a public enemy, and Caesar's adopted son and chosen heir, Gaius Octavianus, was entrusted with the command of the war against him. At the Battle of Mutina Mark Antony was defeated by the consuls Hirtius and Pansa, who were both killed.
ground_truth: Octavian
sub_queries: Who developed Annunciation of Cortona? Answer: Fra Angelico
In what city did Fra Angelico die? Answer: Rome
Who has been designated as the first Emperor of Rome ? Answer: Octavian