The existing reverence for Centrality must have been still further stimulated toward the close of the second century B.C., when the Han Emperor Wu Ti ordered the dynastic color changed to yellow -- which symbolized the Center among the traditional Five Directions -- and took 5 as the dynastic number, believing that he would thus place himself, his imperial family, and the nation under the most auspicious influences.

Emperor Wu consolidated and extended the Chinese empire by pushing back the Xiongnu into the steppes of modern Inner Mongolia, wresting from them the modern areas of Gansu, Ningxia and Qinghai.

The dynasty continued to flourish under Empress Wu Zetian, the only empress regnant in Chinese history, and reached its zenith during the reign of Emperor Xuanzong, who oversaw an empire that stretched from the Pacific to the Aral Sea with at least 50 million people.

Emperor Wu of Han ( r. 141 BC-87 BC ) went to war with the Dayuan for this reason, since the Dayuan were hording a massive amount of tall, strong, Central Asian bred horses in the Hellenized – Greek region of Fergana ( established slightly earlier by Alexander the Great ).

For more than two thousand years, since the time of Emperor Wu of Han, the month containing the winter solstice has almost always been the 11th month.

The Emperor Wu of the Western Han dynasty introduced reforms that have governed the Chinese calendar ever since.

As Confucianism became the preferred philosophy of later Chinese dynasties, starting from the Emperor Wu of Han, Mohism and other non-Confucian philosophical schools of thought were suppressed.

* 141 BC – Liu Che, posthumously known as Emperor Wu of Han, assumes the throne over the Han Dynasty of China.

He is regarded as the father of Chinese historiography for his highly praised work, Records of the Grand Historian, a " Jizhuanti "- style general history of China, covering more than two thousand years from the Yellow Emperor to Emperor Wu of Han.

His father, Sima Tan, served as the Prefect of the Grand Scribes of Emperor Wu of Han ( Emperor " Han Wudi ").

Emperor Wu of Han sent Zhang Qian to explore the west world and to discover other confederates against Xiongnu.

* Emperor Wu of Han, considered one of the greatest emperors throughout the History of China

* Emperor Wu of Northern Zhou

Emperor Emperor Wu of Liu Song | Wu Di ( 420 – 422 )

* Emperor Wu of Han (" Martial Emperor ") starts to rule.

* The Chinese under Emperor Wu of Han besiege and capture Kokand of Dayuan in the Hellenistic Ferghana Valley, during a 2 year war with the Yuezhi.

* Peasant revolts under Emperor Wu of Han.

Emperor Emperor Wu of Liang | Wu Di ( 502 – 549 )

It was the 7th Cavalry whose troopers were charged with guarding the Imperial Palace of the Emperor.

This circular edifice, constructed by Agrippa in B.C. 27, was rebuilt in its present shape by the Emperor Hadrian.

The great column from which the square takes its name was erected by the Emperor Marcus Aurelius.

Among the many severe measures taken by the First Emperor, Shih Huang-ti, in his efforts to insure the continuation of this hard-won national unity, was the burning of the books in 213 B.C., with the expressed intention of removing possible sources for divergent thinking ; ;

It was pleasant last night, therefore, to hear him do something else: a concerto he has recently recorded, `` The Emperor ''.

In three arduous campaigns, the first two of which were conducted by the emperor himself while the third was directed by Manuel Comnenos ( great-uncle of Emperor Manuel Comnenos ), the Turks were defeated in detail in 1070 and driven across the Euphrates.

Emperor Romanos IV was himself taken prisoner and conducted into the presence of Alp Arslan, who treated him with generosity, and, terms of peace having been agreed to, dismissed him, loaded with presents and respectfully attended by a military guard.

Antoninus Pius (; born 19 September 86AD – died 7 March 161AD ), also known as Antoninus, was Roman Emperor from 138AD to 161AD.

He was next appointed by the Emperor Hadrian as one of the four proconsuls to administer Italia, then greatly increased his reputation by his conduct as proconsul of Asia, probably during 134 – 135.

One of his first acts as Emperor was to persuade the Senate to grant divine honours to Hadrian, which they had at first refused ; his efforts to persuade the Senate to grant these honours is the most likely reason given for his title of Pius ( dutiful in affection ; compare pietas ).

Augustus (, September 23, 63 BC – August 19, 14 AD ) was the founder of the Roman Empire and its first Emperor, ruling from 27 BC until his death in 14 AD.

He was succeeded as Emperor by his adopted son ( also stepson and former son-in-law ) Tiberius.

Perisapora was captured and destroyed by Emperor Julian in 363, but speedily rebuilt.

He was a very popular political figure, and since he was the Governor in the effective capital in the Roman West, he was a recognizable figure in the court of the Emperor Valentinian I. Ambrose never married.

He went, his eloquence in defense of the Church reportedly overawed the ministers of Emperor Valentinian, so he was permitted to retire without making the surrender of the churches.

The imperial court was displeased with the religious principles of Ambrose, however his aid was soon solicited by the Emperor.

By 100 Trajan was back in Rome as Emperor instead of merely being a Consul.

Their most famous battle against Rome took place in Argentoratum ( Strasbourg ), in 357, where they were defeated by Julian, later Emperor of Rome, and their king Chnodomarius was taken prisoner to Rome.

Charles, anxious to secure such a famous fighter, gladly assented to Albert's demands and gave the imperial sanction to his possession of the lands taken from the bishops of Würzburg and Bamberg ; and his conspicuous bravery was of great value to the Emperor on the retreat from Metz in January 1553.

The dispute was referred to Emperor Charles V and other princes, but as no settlement was reached Albert continued his efforts to obtain help in view of a renewal of the war.

The city remained a Free Imperial City, subject to the Emperor only, but was politically far too weak to influence the policies of any of its neighbours.

At the beginning of the Hippodrome I saw the Kaiser's Fountain, an ugly octagonal building with a glass dome, built in 1895 by the German Emperor, and on my left, directly across from it, the tomb of Sultan Ahmet, who constructed the Blue Mosque, more properly known by his name.

The Mughal Emperor Farrukhsiyar a grandson of Aurangzeb, is also known to have sent a letter to the Ottomans bu this time it was received by the Grand Vizier Nevşehirli Damad Ibrahim Pasha providing a graphic description of the informing him of the efforts of the Mughal commander Syed Hassan Ali Khan Barha against the Rajput and Maratha rebellion.

Alexander Alexandrovich () ( 10 March 1845 – 1 November 1894 ), known historically as Alexander III or Alexander the Peacemaker reigned as Emperor of Russia from until his death on.

In 1553, the state was captured by the Hindu Emperor Hem Chandra Vikramaditya, popularly known as Hemu, who was killed in 1556 in the Second Battle of Panipat.

Emperor Shāh Jahān later added five pavilions, known as the Baradari, between the garden and the lake.

The strategic significance of the strait was one of the factors in the decision of the Roman Emperor Constantine the Great to found there in AD 330 his new capital, Constantinople, which came to be known as the capital of the Eastern Roman Empire.

In 1019 the construction of the cathedral of Basel ( known locally as the Münster ) began under German Emperor Heinrich II.

On the south side of the great square was erected the Great Palace of the Emperor with its imposing entrance, the Chalke, and its ceremonial suite known as the Palace of Daphne.

However, following the death of an Emperor, they became known also for plunder in the Imperial palaces.

The Qin Emperor presided over the brutal silencing of political opposition, including the event known as the burning of books and burying of scholars.

The best known fictional representation of the Emperor Claudius were the books I, Claudius and Claudius the God ( published in 1934 and 1935 ) by Robert Graves, both written in the first-person to give the reader the impression that they are Claudius ' autobiography.

In the early Church, the first canons were decreed by bishops united in " Ecumenical " councils ( the Emperor summoning all of the known world's bishops to attend with at least the acknowledgement of the Bishop of Rome ) or " local " councils ( bishops of a region or territory ).

* Constantine I, Roman Emperor from 306 to 337, commonly known as Constantine the Great

* Eskender ( 1471 – 1494 ), Emperor of Ethiopia sometimes known as Constantine II

Caligula (; 31 August AD 12 – 24 January AD 41 ), also known as Gaius, was Roman Emperor from 37 AD to 41 AD.

In 1122, Henry V, Holy Roman Emperor entered into an agreement with Pope Calistus II known as the Concordat of Worms.

The Council of Chalcedon was convened by Emperor Marcian, with the reluctant approval of Pope Leo the Great, to set aside the 449 Second Council of Ephesus, better known as the " Robber Council ".

Although little is known about the life and career of Nerva before his accession as Emperor in 96, he appears to have been a highly adaptable diplomat, surviving multiple regime changes and emerging as one of the Flavians ' most trusted advisors.

The Italians took advantage of disorder in northern Ethiopia following the death of Emperor Yohannes IV in 1889 to occupy the highlands and established their new colony, henceforth known as Eritrea, and received recognition from Menelik II, Ethiopia's new Emperor.

Nothing is known of her until in order to seal an alliance between two Saxon kingdoms, her half-brother, King Athelstan of England, sent two of his sisters to Germany, instructing the Duke of Saxony ( later Otto I, Holy Roman Emperor ) to choose whichever one pleased him best.

Emperors have been known to come into conflict with the reigning shogun from time to time ; a notable example is the Hōgen Rebellion of 1156, in which former Emperor Sutoku attempted to seize power from the then current Emperor Go-Shirakawa, both of whom were supported by different clans of samurai.

The Principate ( 27 BC-284 AD ) period was succeeded by what is known as the Dominate ( 284 AD-527 AD ), during which Emperor Diocletian tried to put the Empire on a more formal footing.