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, 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 )

** Emperor Ai of Han ( 27 BC – 1 BC )

Though the unified reign of the First Qin Emperor lasted only 12 years, he managed to subdue great parts of what constitutes the core of the Han Chinese homeland and to unite them under a tightly centralized Legalist government seated at Xianyang ( close to modern Xi ' an ).

Emperor Guangwu reinstated the Han Dynasty with the support of landholding and merchant families at Luoyang, east of Xi ' an.

Chiang Kai-shek considered both the Han Chinese and all the minority peoples of China, the Five Races Under One Union, as descendants of Huangdi, the Yellow Emperor and semi mythical founder of the Chinese nation, and belonging to the Chinese Nation Zhonghua Minzu and he introduced this into Kuomintang ideology, which was propagated into the educational system of the Republic of China.

According to the Han Shu 21a, 973, for the moment of unification the Middle kingdoms had 6 different calendars: those of the mythological progenitors Yellow Emperor ( 黄帝曆 ) and Zhuanxu ( 顓頊曆 ); of the dynasties Xia ( 夏曆 ), Yin ( 殷曆 ), and Zhou ( 周曆 ), and of the Zhou Dynasty state of Lu ( 鲁曆 ).

The " Heshang Gong Version " is named after the legendary Heshang Gong ( " Riverside Sage ") who supposedly lived during the reign ( 202-157 BC ) of Emperor Wen of Han.

* 220 – Cao Pi forces Emperor Xian of Han to abdicated the Han Dynasty throne.

* 202 BC – coronation ceremony of Liu Bang as Emperor Gaozu of Han takes place, initiating four centuries of the Han Dynasty's rule over China.

It provides an overview of the history of China covering more than two thousand years from the legendary Yellow Emperor to Sima's contemporary Emperor Han Wudi ( 漢武帝 ).

* 195 BC – Emperor Gaozu of Han ( b. 256 )

) raided and defeated the Xiongnu, killing 2000, after having received generous gifts from Emperor Guangwu of Han.

* 313 – Emperor Jin Huidi is executed by Liu Cong, ruler of the Xiongnu state ( Han Zhao ).

In the year 1712, the Mughal Emperor Jahandar Shah, a grandson of Aurangzeb sent gifts to the Ottoman Sultan Ahmad III and refereed to himself as the Ottoman Sultan's devoted admirer.

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.

In 1054 King Edward sent Ealdred to Germany to obtain Emperor Henry III's help in returning Edward the Exile, son of Edmund Ironside, to England.

He later sent a letter to Yeshaq's successor Zara Yaqob in 1450, in which he wrote that he would be happy to send artisans to Ethiopia if their safe arrival could be guaranteed, but it probably never reached the Emperor.

He was next sent by the Pope to the Emperor Sigismund to ask his aid in the pope's efforts to end this Council, which for five years had been encroaching on papal prerogatives.

Roman control of Britain finally ended in the early part of the 5th century ; the date usually given as marking the end of Roman Britain is 410, when the Emperor Honorius sent letters to the British, urging them to look to their own defence.

There he saw " the things which have been sent to the king from the golden land "— the Aztec treasure that Hernán Cortés had sent home to Holy Roman Emperor Charles V following the fall of Mexico.

Having fled to Egypt, Cyril bribed Theodosius ' courtiers, and sent a mob led by Dalmatius, a hermit, to besiege Theodosius ' palace, and shout abuse ; the Emperor eventually gave in, sending Nestorius into minor exile ( Upper Egypt ).

A second, larger, expedition sent by Emperor Kangxi expelled the Dzungars from Tibet in 1720 and the troops were hailed as liberators.

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.

Although the empire was again subdivided and a co-emperor sent to Italy at the end of the fourth century, the office became unitary again only 95 years later at the request of the Roman Senate and following the death of Julius Nepos, last Western Emperor.

Hikami no Kawatsugu, a son of Emperor Temmu's grandson Prince Shioyaki and Shōmu's daughter Fuwa, attempted to carry out a coup d ' état in 782, but it failed and Kawatsugu and his mother were sent into exile.

The newly designated Mughal Subedar of the province immediately sent a letter to the British authorities at Fort St George demanding that the English at Madras acknowledge the overlordship of the Mughal Emperor.

He was sent in 1515 as part of the Portuguese embassy to the ( Emperor of Ethiopia ), accompanied by the Ethiopian ambassador Matheus.

Though he had a happy childhood surrounded by his many siblings, his family knew Francis was likely to be a future Emperor ( his uncle Joseph had no surviving issue from either of his two marriages ), and so in 1784 the young Archduke was sent to the Imperial Court in Vienna to educate and prepare him for his future role.

* 1552-After the requests from the inhabitants of the town, Charles I of Spain ( the Emperor Charles V ) sent the Italian engineer Giovanni Battista Calvi to strengthen the defences of the town.

However, this all changed in 450 when Honoria, sister of the Western Roman Emperor Valentinian III, sent Attila a ring and requested his help to escape her betrothal to a senator.

Hoping to avoid the sack of Rome herself, Emperor Valentinian III sent three envoys, the high civilian officers Gennadius Avienus and Trigetius, as well as the Bishop of Rome Leo I, who met Attila at Mincio in the vicinity of Mantua, and obtained from him the promise that he would withdraw from Italy and negotiate peace with the emperor.

Theodorus Lector, in his 6th-century History of the Church 1: 1 stated that Eudokia ( wife of Theodosius II, died 460 ) sent an image of " the Mother of God " named Icon of the Hodegetria from Jerusalem to Pulcheria, daughter of the Emperor Arcadius: the image was specified to have been " painted by the Apostle Luke.

In the year 1623, the Mughal Emperor Jahangir, sent his Tahwildar, Khan Alam to Safavid Persia, accompanied by 800 Sepoys, scribes and scholars along with 10 Howdahs well decorated in gold and silver, in order to negotiate peace with Abbas I of Persia after a brief conflict in the region around Kandahar.

It seemed likely that Antioch itself would fall to Nur ad-Din, but he withdrew when Emperor Manuel sent a large Byzantine force to the area.

The Exarch sent to Italy by Emperor Justin II, Longinus, could defend only coastal cities that could be supplied by the powerful Byzantine fleet.

The friendship of the Emperor Constantine raised him from penury and he became tutor in Latin to his son Crispus, whom Lactantius may have followed to Trier in 317, when Crispus was made Caesar ( lesser co-emperor ) and sent to the city.

In 1562, the Bavarian government sent a long plea to the Holy Roman Emperor asking him to stop the cutting of yew, and outlining the damage done to the forests by its selective extraction, which broke the canopy and allowed wind to destroy neighbouring trees.