Information: - Athens ("Athina" ) is the capital and largest city of Greece. Athens dominates the Attica region and is one of the world's oldest cities, with its recorded history spanning over 3,400 years, and its earliest human presence starting somewhere between the 11th and 7th millennia BC. Classical Athens was a powerful city-state that emerged in conjunction with the seagoing development of the port of Piraeus, which had been a distinct city prior to its 5th century BC incorporation with Athens. A centre for the arts, learning and philosophy, home of Plato's Academy and Aristotle's Lyceum, it is widely referred to as the cradle of Western civilization and the birthplace of democracy, largely because of its cultural and political impact on the European continent, and in particular the Romans. In modern times, Athens is a large cosmopolitan metropolis and central to economic, financial, industrial, maritime, political and cultural life in Greece. In 2015, Athens was ranked the world's 29th richest city by purchasing power and the 67th most expensive in a UBS study. - Princeps (plural: principes) is a Latin word meaning "first in time or order; the first, foremost, chief, the most eminent, distinguished, or noble; the first man, first person." - The Pontifex Maximus (Latin, literally: "greatest pontiff" or "greatest bridge-builder") was the high priest of the College of Pontiffs ("Collegium Pontificum") in ancient Rome. This was the most important position in the ancient Roman religion, open only to patricians until 254 BC, when a plebeian first occupied this post. A distinctly religious office under the early Roman Republic, it gradually became politicized until, beginning with Augustus, it was subsumed into the Imperial office. Its last use with reference to the emperors is in inscriptions of Gratian (reigned 375383) who, however, then decided to omit the words "pontifex maximus" from his title. Although the most influential office within Roman priesthood, the "pontifex maximus" was ranked the fifth in the ranking of the highest Roman priests ("ordo sacerdotum"), behind the "rex sacrorum" and the "flamines maiores" ("Flamen Dialis", "Flamen Martialis", "Flamen Quirinalis"). - The Parthenon ( "Parthenonas") is a former temple, on the Athenian Acropolis, Greece, dedicated to the goddess Athena, whom the people of Athens considered their patron. Construction began in 447BC when the Athenian Empire was at the peak of its power. It was completed in 438BC although decoration of the building continued until 432BC. It is the most important surviving building of Classical Greece, generally considered the zenith of the Doric order. Its decorative sculptures are considered some of the high points of Greek art. The Parthenon is regarded as an enduring symbol of Ancient Greece, Athenian democracy and western civilization, and one of the world's greatest cultural monuments. The Greek Ministry of Culture is currently carrying out a programme of selective restoration and reconstruction to ensure the stability of the partially ruined structure. - The Roman emperor was the ruler of the Roman Empire during the imperial period (starting in 27 BC). The emperors used a variety of different titles throughout history. Often when a given Roman is described as becoming "emperor" in English, it reflects his taking of the title "Augustus" or "Caesar". Another title often used was "imperator", originally a military honorific. Early Emperors also used the title "princeps" (first citizen). Emperors frequently amassed republican titles, notably "Princeps Senatus", "Consul" and "Pontifex Maximus". - The Acropolis of Athens (Ancient Greek: "Akropolis") is an ancient citadel located on an extremely rocky outcrop above the city of Athens and contains the remains of several ancient buildings of great architectural and historic significance, the most famous being the Parthenon. The word acropolis comes from the Greek words ("akron", "highest point, extremity") and ("polis", "city"). Although there are many other acropoleis in Greece, the significance of the Acropolis of Athens is such that it is commonly known as "The Acropolis" without qualification. - Hadrian (24 January 76 10 July 138) was Roman emperor from 117 to 138. Hadrian is known for building Hadrian's Wall, which marked the northern limit of Britannia. He also rebuilt the Pantheon and constructed the Temple of Venus and Roma. Philhellene in most of his tastes, he is considered by some to have been a humanist, and he is regarded as the third of the Five Good Emperors. - The military, also called the armed forces, are forces authorized to use deadly force, and weapons, to support the interests of the state and some or all of its citizens. The task of the military is usually defined as defense of the state and its citizens, and the prosecution of war against another state. The military may also have additional sanctioned and non-sanctioned functions within a society, including, the promotion of a political agenda, protecting corporate economic interests, internal population control, construction, emergency services, social ceremonies, and guarding important areas. The military can also function as a discrete subculture within a larger civil society, through the development of separate infrastructures, which may include housing, schools, utilities, food production and banking. - Hadrian 's Library was created by Roman Emperor Hadrian in AD 132 on the north side of the Acropolis of Athens . The building followed a typical Roman Forum architectural style , having only one entrance with a propylon of Corinthian order , a high surrounding wall with protruding niches ( oikoi , exedrae ) at its long sides , an inner courtyard surrounded by columns and a decorative oblong pool in the middle . The library was on the eastern side where rolls of papyrus '' books '' were kept . Adjoining halls were used as reading rooms , and the corners served as lecture halls . The library was seriously damaged by the Herulian invasion of 267 and repaired by the prefect Herculius in AD 407 - 412 . During Byzantine times , three churches were built at the site , the remains of which are preserved : a tetraconch ( 5th century AD ) a three - aisled basilica ( 7th century ) , and a simple cathedral ( 12th century ) , which was the first cathedral of the city , known as Megali Panagia . Around the same period as the cathedral another church , Agios Asomatos sta Skalia , was built against the north facade , but it is not preserved . - Augustus (23 September 63 BC 19 August 14 AD) was the founder of the Roman Principate and considered the first Emperor, controlling the Roman Empire from 27 BC until his death in AD 14. - The Temple of Venus and Roma Latin: Templum Veneris et Romae is thought to have been the largest temple in Ancient Rome. Located on the Velian Hill, between the eastern edge of the "Forum Romanum" and the Colosseum, it was dedicated to the goddesses "Venus Felix" ("Venus the Bringer of Good Fortune") and "Roma Aeterna" ("Eternal Rome"). The architect was the emperor Hadrian and construction began in 121. It was officially inaugurated by Hadrian in 135, and finished in 141 under Antoninus Pius. Damaged by fire in 307, it was restored with alterations by the emperor Maxentius. Given the information, choose the subject and object entities that have the relation of 'significant event'.
Answer:
hadrian's library , construction