John Zonaras (Greek: Ἰωάννης Ζωναρᾶς, Iōánnēs Zōnarâs; fl. 12th century) was a Byzantine chronicler and theologian who lived at Constantinople. Under Emperor Alexios I Komnenos he held the offices of head justice and private secretary (protasēkrētis) to the emperor, but after Alexios' death, he retired to the monastery of St Glykeria, where he spent the rest of his life writing books.
His most important work, Extracts of History (Greek: Ἐπιτομὴ Ἱστοριῶν, Latin: Epitome Historiarum), in eighteen books, extends from the creation of the world to the death of Alexius (1118). The earlier part is largely drawn from Josephus; for Roman history he chiefly followed Cassius Dio up to the early third century. Contemporary scholars are particularly interested in his account of the third and fourth centuries, which depend upon sources, now lost, whose nature is fiercely debated. Central to this debate is the work of Bruno Bleckmann, whose arguments tend to be supported by continental scholars but rejected in part by English-speaking scholars. An English translation of these important sections has recently been published: Thomas Banchich and Eugene Lane, The History of Zonaras from Alexander Severus to the Death of Theodosius the Great (Routledge 2009). The chief original part of Zonaras' history is the section on the reign of Alexios Komnenos, whom he criticizes for the favour shown to members of his family, to whom Alexios entrusted vast estates and significant state offices. His history was continued by Nicetas Acominatus.
Ioannes, (Latin: Iohannes Augustus) known in English as Joannes or even John, was a Roman usurper (423–425) against Valentinian III.
On the death of the Emperor Honorius (August 15, 423), Theodosius II, the remaining ruler of the House of Theodosius hesitated in announcing his uncle's death. In the interregnum, Honorius's patrician at the time of his death, Castinus, elevated Joannes as emperor.
Joannes was a primicerius notariorum or senior civil servant at the time of his elevation. Procopius praised him as "both gentle and well-endowed with sagacity and thoroughly capable of valorous deeds." Unlike the Theodosian emperors, he tolerated all Christian sects.
From the beginning, his control over the empire was insecure. In Gaul, his praetorian prefect was slain at Arles in an uprising of the soldiery there. And Bonifacius, Comes of the Diocese of Africa, held back the grain fleet destined to Rome.
"The events of Johannes' reign are as shadowy as its origins," writes John Matthews, who then provides a list of the ruler's known actions in a single paragraph. Joannes was proclaimed at Rome and praetorian games were provided at the expense of a member of the gens Anicia. Johannes then moved his base of operations to Ravenna, knowing full well that the Eastern Empire would strike from that direction. There is a mention of an expedition against Africa, but its fate, presumed unsuccessful, is unrecorded. In Gaul, he appears to have caused offense by submitting clerics to secular courts. And that is all.