Irene of Athens in the context of "Leo IV the Khazar"

Michael I Rangabe (also spelled Rhangabe; Greek: Μιχαὴλ Αʹ Ῥαγκαβές, romanized: Mikhaḗl 1 Rhangkabés; c. 770 – 11 January 844) was Byzantine emperor from 811 to 813. A courtier of Emperor Nikephoros I (r. 802–811), he survived the disastrous campaign against the Bulgars and was preferred as imperial successor over Staurakios (r. 811–811), who was severely injured. He was proclaimed emperor by Patriarch Nicephorus I of Constantinople on 2 October 811.

Michael's policies were generally conciliatory, and he was overwhelmingly influenced by the iconodule clerics Nikephoros and Theodore the Stoudite. He improved relations with the Franks, even to the point of recognising Charlemagne as an emperor – although not "of the Romans" – and requesting papal arbitration in the Moechian controversy. His half-hearted leadership of the campaign against the Bulgars resulted in defeat in the Battle of Versinikia. The stratēgos of the Anatolic Theme, Leo the Armenian, a popular and successful general, abandoned Michael on the battlefield but was proclaimed emperor by the military, in what was the last military overthrow of an emperor in Byzantine history. Michael was pressured to abdicate, and he retired to a monastery. His sons were castrated to prevent the continuation of his dynasty.

Nikephoros I (Greek: Νικηφόρος, romanized: Nikēphóros; 750 – 26 July 811), also known as Nicephorus I, was Byzantine emperor from 802 to 811. He was General Logothete (finance minister) under Empress Irene, but later overthrew her to seize the throne for himself. Prior to becoming emperor, he was sometimes referred to as "the Logothete" (Greek: ὁ Λογοθέτης) and "Genikos" or "Genicus" (Greek: ὁ Γενικός), in recognition of his previous role as General Logothete.

During his reign, Nikephoros engaged in military campaigns against both the Arabs and the Bulgarians, although the outcomes were varied. While leading an invasion into Bulgaria, he suffered a defeat and was killed at the Battle of Pliska.

George Syncellus (Greek: Γεώργιος Σύγκελλος, Georgios Synkellos; died after 810) was a Byzantine chronicler and ecclesiastical official. He lived many years in Palestine (probably in the Old Lavra of Saint Chariton or Souka, near Tekoa) as a monk, before coming to Constantinople, where he was appointed synkellos (literally, "cell-mate") to Tarasius, patriarch of Constantinople. He later retired to a monastery to write what was intended to be his great work, a chronicle of world history, Ekloge chronographias (Ἐκλογὴ Χρονογραφίας), or Extract of Chronography. According to Anastasius Bibliothecarius, George "struggled valiantly against heresy [i.e. Iconoclasm] and received many punishments from the rulers who raged against the rites of the Church", although the accuracy of the claim is suspect.

As a synkellos, George stood high in the ecclesiastical establishment of Constantinople. The position carried no defined duties, but the incumbent would generally serve as the patriarch's private secretary, and might also be used by the Emperor to limit the movements and actions of a troublesome patriarch (as was the case during the reign of Constantine VI, when several of George's colleagues were set as guards over Patriarch Tarasius). The office would be an imperial gift by the time of Basil I, and was probably so earlier; as such, George may well have owed his position to the Empress Irene. Many synkelloi would go on to become Patriarchs of Constantinople, or Bishops of other sees (for example George's colleague, John, another synkellos under Patriarch Tarasius, who became Metropolitan Bishop of Sardis in 803).

Staurakios or Stauracius (Greek: Σταυράκιος, romanized: Staurákios; early 790s – 11 January 812) was the shortest-reigning Byzantine emperor, ruling for 68 days between 26 July and 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.

Nikephoros I (Greek: Νικηφόρος, romanized: Nikēphóros; 750 – 26 July 811), also known as Nicephorus I, was Byzantine emperor from 802 to 811. He was General Logothete (finance minister) under Empress Irene, but later overthrew her to seize the throne for himself. Prior to becoming emperor, he was sometimes referred to as "the Logothete" (Greek: ὁ Λογοθέτης) and "Genikos" or "Genicus" (Greek: ὁ Γενικός), in recognition of his previous role as General Logothete.

During his reign, Nikephoros engaged in military campaigns against both the Arabs and the Bulgarians, although the outcomes were varied. While leading an invasion into Bulgaria, he suffered a defeat and was killed at the Battle of Pliska.

Bardanes, nicknamed Tourkos, "the Turk" (Greek: Βαρδάνης ὁ Τοῦρκος, romanized: Bardanēs ho Tourkos, fl. 795–803), was a Byzantine general who launched an unsuccessful rebellion against Emperor Nikephoros I (r. 802–811) in 803. Although a major supporter of Byzantine empress Irene of Athens (r. 797–802), 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. He was of Turkic origin