The 800s decade ran from January 1, 800, to December 31, 809.
The 810s decade ran from January 1, 810, to December 31, 819.
The 780s decade ran from January 1, 780, to December 31, 789.
Year 804 (DCCCIV) was a leap year starting on Monday of the Julian calendar.
Year 806 (DCCCVI) was a common year starting on Thursday of the Julian calendar, the 806th year of the Common Era (CE) and Anno Domini (AD) designations, the 806th year of the 1st millennium, the 6th year of the 9th century, and the 7th year of the 800s decade.
Year 803 (DCCCIII) was a common year starting on Sunday of the Julian calendar.
Year 802 (DCCCII) was a common year starting on Saturday of the Julian calendar, the 802nd year of the Common Era (CE) and Anno Domini (AD) designations, the 802nd year of the 1st millennium, the 2nd year of the 9th century, and the 3rd year of the 800s decade.
Year 828 (DCCCXXVIII) was a leap year starting on Wednesday of the Julian calendar.
Abu Ja'far Harun ibn Muhammad al-Mahdi or simply Harun ibn al-Mahdi, famously known as Harun al-Rashid, was the fifth Abbasid caliph of the Abbasid Caliphate, reigning from September 786 until his death in March 809. His reign is traditionally regarded to be the beginning of the Islamic Golden Age. His epithet al-Rashid translates to "the Orthodox", "the Just", "the Upright", or "the Rightly-Guided".
Staurakios, also called Stauracius, was Byzantine emperor from 26 or 28 July to 2 October 811. He was born in the early 790s, probably between 791 and 793, to Nikephoros I and an unknown woman. Nikephoros seized the throne of the Byzantine Empire from Empress Irene in 802, and elevated Staurakios to co-emperor on 25 December 803. On 20 December 807, a bride show was held by Nikephoros to select a wife for Staurakios, which resulted in his marriage to Theophano of Athens, a kinswoman of Irene. Little else is known of him until he came to take the throne upon the death of Nikephoros.
Michael of Synnada or Michael the Confessor was a metropolitan bishop of Synnada from 784/7 to 815. He represented Byzantium in diplomatic missions to Harun al-Rashid and Charlemagne. He was exiled by Emperor Leo V the Armenian because of his opposition to iconoclasm, and died on 23 May 826. He is honoured as a saint by the Eastern Orthodox and Roman Catholic churches, his feast day is May 23.
There was an Abbasid–Carolingian alliance during the 8th and 9th centuries, effected through a series of embassies, rapprochements and combined military operations between the Frankish Carolingian Empire and the Abbasid Caliphate.
The Battle of Krasos was a battle in the Arab–Byzantine Wars that took place in August 804, between the Byzantines under Emperor Nikephoros I and an Abbasid army under Ibrahim ibn Jibril. Nikephoros' accession in 802 resulted in a resumption of warfare between Byzantium and the Abbasid Caliphate. In late summer 804, the Abbasids had invaded Byzantine Asia Minor for one of their customary raids, and Nikephoros set out to meet them. He was surprised, however, at Krasos and heavily defeated, barely escaping with his own life. A truce and prisoner exchange were afterwards arranged. Despite his defeat, and a massive Abbasid invasion the next year, Nikephoros persevered until troubles in the eastern provinces of the Caliphate forced the Abbasids to conclude a peace.
Bardanes, nicknamed Tourkos, "the Turk", was a Byzantine general who launched an unsuccessful rebellion against Emperor Nikephoros I in 803. Although a major supporter of Byzantine empress Irene of Athens, soon after her overthrow he was appointed by Nikephoros as commander-in-chief of the Anatolian armies. From this position, he launched a revolt in July 803, probably in opposition to Nikephoros's economic and religious policies. His troops marched towards Constantinople, but failed to win popular support. At this point, some of his major supporters deserted him and, reluctant to engage the loyalist forces in battle, Bardanes gave up and chose to surrender himself. He retired as a monk to a monastery he had founded. There he was blinded, possibly on Nikephoros's orders.
The Battle of Kopidnadon or Kopidnados took place in September 788 between the armies of the Abbasid Caliphate and the Byzantine Empire. The Abbasid army launched an invasion of Byzantine Asia Minor, and was confronted by a Byzantine force at Kopidnadon. The resulting battle was an Abbasid victory. Among the Byzantine losses was a certain Diogenes, who is identified by some scholars with the probable original source for the literary hero Digenes Akritas.
The Abbasid invasion of Asia Minor in 782 was one of the largest operations launched by the Abbasid Caliphate against the Byzantine Empire. The invasion was launched as a display of Abbasid military might in the aftermath of a series of Byzantine successes. Commanded by the Abbasid heir-apparent, the future Harun al-Rashid, the Abbasid army reached as far as Chrysopolis, across the Bosporus from the Byzantine capital, Constantinople, while secondary forces raided western Asia Minor and defeated the Byzantine forces there. As Harun did not intend to assault Constantinople and lacked ships to do so, he turned back.
The 806 invasion of Asia Minor was the largest of a long series of military operations launched by the Abbasid Caliphate against the Byzantine Empire. The expedition took place in southeastern and central Asia Minor, where the two states shared a long land border.
Ḥumayd ibn Ma'yūf al-Ḥajūrī was an Arab commander in Abbasid service in the early 9th century.
Sa'id ibn Salm al-Bahili was an Arab governor and military commander of the early Abbasid Caliphate.
