Nikephoros I or Nicephorus I was Byzantine emperor from 802 to 811. Having served Empress Irene as genikos logothetēs, he subsequently ousted her from power and took the throne himself.
Nikephoros was appointed finance minister (logothetēs tou genikou) by the Empress Irene. He figured prominently in a courtiers' power struggle which eventually dethroned Irene and sent her into exile. With the support of his co-conspirators, Nikephoros was installed as the new emperor on 31 October 802. He crowned his son Staurakios co-emperor in 803.
Nikephoros embarked on a general reorganization of the Roman Empire and a strengthening of its frontiers. He created new themes in the Balkans, populating them with Greeks resettled from Anatolia. Needing large sums to increase his military forces, he managed the empire's finances with a rigor that earned the hostility of his subjects. According to two later chronicles, the 10th-century Theophanes Continuatus and the 13th-century Synopsis Chronike, the revolt of the general Bardanes Tourkos in 803 may have been prompted by displeasure over Nikephoros' handling of army pay. Nikephoros secretly negotiated with two of Bardanes' key supporters, the generals Leo and Michael, who convinced the rebel army to disperse. Bardanes was captured, blinded, and relegated to a monastery. A conspiracy headed by the patrician Arsaber had a similar result.
In 803, Nikephoros concluded a treaty, called the "Pax Nicephori", with Charlemagne, but refused to recognize the latter's imperial dignity. Relations deteriorated and led to a war over Venice in 806–810. In the process, Nikephoros had quelled a Venetian rebellion in 807, but suffered extensive losses to the Franks. The conflict was resolved only after Nikephoros' death, and Venice, Istria, the Dalmatian coast and Southern Italy were assigned to the East, while Rome, Ravenna and the Pentapolis were included in the Western realm.
By withholding the tribute which Irene had agreed to pay to the caliph Hārūn al-Rashīd, Nikephoros committed himself to a war against the Arabs. Compelled by Bardanes' disloyalty to take the field himself, he sustained a severe defeat at the Battle of Krasos in Phrygia (805).[5] In 806 a Muslim army of 135,000 men invaded the Empire. Unable to counter the Muslim numbers, Nikephoros agreed to make peace on condition of paying 50,000 nomismata immediately and a yearly tribute of 30,000 nomismata. With a succession struggle enveloping the caliphate on the death of Hārūn al-Rashīd in 809, Nikephoros was free to deal with Krum, Khan of Bulgaria, who was harassing his northern frontiers and had just conquered Serdica (Sofia).
In 811, Nikephoros invaded Bulgaria, defeated Krum twice, and sacked the Bulgarian capital Pliska. The Chronicle of the 12th-century patriarch of the Syrian Jacobites, Michael the Syrian, describes the brutalities and atrocities of Nikephoros: "Nikephoros, emperor of the Roman Empire, walked into the Bulgarians' land: he was victorious and killed great number of them. He reached their capital, seized it and devastated it. His savagery went to the point that he ordered to bring their small children, got them tied down on earth and made thresh grain stones to smash them." During Nikephoros' retreat, the imperial army was ambushed and destroyed in Varbishki mountain passes at the Battle of Pliska by Krum. Nikephoros was killed during the battle, whereafter Krum ordered his decapitation. Krum is said to have made a drinking-cup of Nikephoros' skull.
Irene of Athens was Byzantine empress consort to Emperor Leo IV from 775 to 780, regent during the childhood of their son Constantine VI from 780 until 790, co-ruler from 792 until 797, and finally empress regnant and sole ruler of the Eastern Roman Empire from 797 to 802. A member of the politically prominent Sarantapechos family, she was selected as Leo IV's bride for unknown reasons in 768. Even though her husband was an iconoclast, she harbored iconophile sympathies. During her rule as regent, she called the Second Council of Nicaea in 787, which condemned iconoclasm as heretical and brought an end to the first iconoclast period (730–787). Her public figure was very polarizing during her 5 year reign, as most saw a woman not right to solely rule. Her sole reign made her the first ever empress regnant, ruling in her own right, in Roman and Byzantine imperial history.
In 802 the patricians conspired against her, deposing her on 31 October, and placing Nikephoros, the minister of finance on the throne. Irene was exiled to Lesbos and forced to support herself by spinning wool. She died the following year, on 9 August.
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