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Ferdinand IV, Spanish king of Castile and León

(Encyclopedia)Ferdinand IV, 1285–1312, Spanish king of Castile and León (1295–1312), son and successor of Sancho IV. His mother, María de Molina, was regent during his turbulent minority. He tried unsuccessfu...

Philip, Roman emperor

(Encyclopedia)Philip or Philip the Arabian (Marcus Julius Philippus), 204?–249, Roman emperor (244–49). He served under Gordian III against the Persians, instigated the assassination of the emperor, and conclud...

Theodore of Studium, Saint

(Encyclopedia)Theodore of Studium, Saint sto͞oˈdēəm [key], 759–826, Byzantine Greek monastic reformer, also called St. Theodore the Studite. As an abbot he was early exiled for opposing the marriage of Empero...

Byzantium

(Encyclopedia)Byzantium bīzănˈshēəm, –shəm, –tēəm [key], ancient city of Thrace, on the site of the present-day İstanbul, Turkey. Founded by Greeks from Megara in 667 b.c., it early rose to importance ...

Alexius V

(Encyclopedia)Alexius V (Alexius Ducas Mourtzouphlos) do͞oˈkəsmo͝ortˈso͞oflŏs [key], d. 1204, Byzantine emperor (1204), son-in-law of Alexius III. The head of the Byzantine national party, he overthrew emper...

Monotheletism

(Encyclopedia)Monotheletism or Monothelitism both: mənŏthˈə lĭtĭzˌəm [key] [Gr.,=one will], 7th-century opinion condemned as heretical by the Third Council of Constantinople in 680 (see Constantinople, Thir...

Baldwin IV, Latin king of Jerusalem

(Encyclopedia)Baldwin IV (Baldwin the Leper), c.1161–1185, Latin king of Jerusalem (1174–85), son and successor of Amalric I. Raymond, count of Tripoli, was regent from 1174 to 1176. Baldwin was constantly enga...

Valerian, Roman emperor

(Encyclopedia)Valerian (Publius Licinius Valerianus) vəlērˈēən [key], d. after 260, Roman emperor (253–60). He held important posts, both civil and military, under the emperors Decius and Gallus. After the s...

Henry IV, king of England

(Encyclopedia)Henry IV, 1367–1413, king of England (1399–1413), eldest son of John of Gaunt and grandson of Edward III; called Henry of Bolingbroke. He founded the Lancastrian dynasty. The new king was immed...