The age of Iconoclasm: 717 - 867

Constantine's weak successors

His successors all but let slip the gains won by the great iconoclast. Constantine's son Leo IV died prematurely in 780, leaving to succeed him his 10-year-old son, Constantine VI, under the regency of the empress Irene. Not much can be said for Constantine, and Irene's policies as regent and (after the deposition and blinding of her son at her orders) as sole ruler from 797 to 802 were all but disastrous. Her iconodule policies alienated many among the themal troops, who were still loyal to the memory of the great warrior emperor, Constantine V. In an effort to maintain her popularity among the monkish defenders of the icons and with the population of Constantinople, she rebated taxes to which these groups were subject; she also reduced the customs duties levied outside the port of Constantinople, at Abydos and Hieros. The consequent loss to the treasury weighed all the more severely since victories won by the Arabs in Asia Minor (781) and by the Bulgars (792) led both peoples to demand and receive tribute as the price of peace. A revolt of the higher palace officials led to Irene's deposition in 802, and the so-called Isaurian dynasty of Leo III ended with her death, in exile, on the isle of Lesbos.

In the face of the Bulgar menace, none of the following three emperors succeeded in founding a dynasty. Nicephorus I (ruled 802 - 811), the able finance minister who succeeded Irene, reimposed the taxes that the Empress had remitted and instituted other reforms that provide some insight into the financial administration of the empire during the early 9th century. In the tradition of Constantine V, Nicephorus strengthened the fortifications of Thrace by settling, in that theme, colonists from Asia Minor.

Taking arms himself, he led his troops against the new and vigorous Bulgar khan, Krum, only to meet defeat and death at the latter's hands. His successor, Michael I Rhangabe (811 - 813), fared little better; internal dissensions broke up his army as it faced Krum near Adrianople, and the resulting defeat cost Michael his throne. In only one respect does he occupy an important place in the annals of the Byzantine Empire. The first emperor to bear a family name, Michael's use of the patronymic, Rhangabe, bears witness to the emergence of the great families, whose accumulation of landed properties would soon threaten the integrity of those smallholders upon whom the empire depended for its taxes and its military service. The name Rhangabe seems to be a Hellenized form of a Slav original (rokavu), and, if so, Michael's ethnic origin and that of his successor, Leo V the Armenian (ruled 813 - 820), provide evidence enough of the degree to which Byzantium in the 9th century had become not only a melting-pot society but, further, a society in which even the highest office lay open to the man with the wits and stamina to seize it. Leo fell victim to assassination, but before his death events beyond his control had improved the empire's situation. Krum died suddenly in 814 as he was preparing an attack upon Constantinople, and his son, Omortag, arranged a peace with the Byzantine Empire in order to protect the western frontiers of his Bulgar empire against the pressures exerted by Frankish expansion under Charlemagne and his successors. Since the death of the fifth caliph, Harun ar-Rashid, had resulted in civil war in the Muslim world, hostilities from that quarter ceased. Leo used the breathing space to reconstruct those Thracian cities that the Bulgars had earlier destroyed. His work indicates the degree of gradual Byzantine penetration into the coastal fringes of the Balkan Peninsula, as does the number of themes organized in that same region during the early 9th century: those of Macedonia, Thessalonica, Dyrrhachium, Dalmatia, and the Strymon.

The new emperor, Michael II, was indeed able to establish a dynasty - the Amorian, or Phrygian - his son Theophilus (829 - 842) and his grandson Michael III (842 - 867) each occupying the throne in turn, but none would have forecast so happy a future during Michael II's first years. Thomas the Slavonian, Michael's former comrade in arms, gave himself out to be the unfortunate Constantine VI and secured his coronation at the hands of the Patriarch of Antioch; this was accomplished with the willing permission of the Muslim caliph under whose jurisdiction Antioch lay. Thomas thereupon marched to Constantinople at the head of a motley force of Caucasian peoples whose sole bonds were to be found in their devotion to iconodule doctrine and their hatred of Michael's Iconoclasm. Assisted by Omortag and relying upon the defenses of Constantinople, Michael defeated his enemy, but the episode suggests the tensions beneath the surface of Byzantine society: the social malaise, the ethnic hostility, and the persisting discord created by Iconoclasm. All these may explain the weakness displayed throughout Theophilus' reign, when a Muslim army defeated the Emperor himself (838) as a prelude to the capture of the fortress of Amorium in Asia Minor. It may also explain the concurrent decline of Byzantine strength in the Mediterranean, manifest in the capture of Crete by the Arabs (826 or 827) and in the initiation of attacks upon Sicily that finally secured the island for the world of Islam. Iconoclasm certainly played its part in the further alienation of East from West, and a closer examination of its doctrines will suggest why this may have been.