Constantine V vs Henry III of England

Constantine V convened the Council of Hieria, which formally condemned the veneration of icons as idolatry. This council established iconoclasm as official Byzantine Church doctrine, intensifying the religious controversy that divided the empire.

Following the Council of Hieria, Constantine V intensified persecution of icon venerators. Monks were imprisoned, executed, or forced to marry. Monasteries were confiscated and converted to barracks or secular use. This policy deepened the iconoclast schism.

Constantine V led nine major campaigns against the Bulgarian Empire, achieving several victories including the Battle of Marcellae (759) and the Battle of Anchialus (763). These campaigns temporarily weakened Bulgaria but did not destroy it.

Constantine V oversaw the restoration of the Aqueduct of Valens, which had been damaged by the Avars. The repaired aqueduct restored water supply to Constantinople, improving urban infrastructure and public health.

Constantine V died while on campaign against the Bulgars. His death occurred during a military expedition, and he was succeeded by his son Leo IV. His campaigns had temporarily checked Bulgarian expansion but left the empire exhausted.

Henry III began the rebuilding of Westminster Abbey in the Gothic style, dedicating it to Edward the Confessor. This project became a major architectural achievement and a symbol of royal piety and power.

Under baronial pressure, Henry III agreed to the Provisions of Oxford, which established a council of barons to oversee royal governance. This reform limited royal power and created a precedent for parliamentary oversight.

Henry III faced the Second Barons' War led by Simon de Montfort. He was captured at the Battle of Lewes, but later restored after the royalist victory at the Battle of Evesham, where de Montfort was killed.

Royalist forces under Prince Edward defeated Simon de Montfort's army at the Battle of Evesham. De Montfort was killed, ending the baronial rebellion and restoring Henry III's full authority.

Henry III issued the Dictum of Kenilworth, a compromise that allowed rebel barons to reclaim their lands by paying fines. This helped reconcile the kingdom after the Second Barons' War.