* Constantine XI Palaiologos Dragases

* 1449 – Constantine XI is crowned Byzantine-Roman Emperor at Mystras.

Ivan III married Sophia Palaiologina, the niece of the last Byzantine emperor Constantine XI, and made the Byzantine double-headed eagle his own, and eventually Russian, coat-of-arms.

* 1453: The Fall of Constantinople marks the end of the Byzantine Empire and the death of the last Roman Emperor Constantine XI and the beginning of the Growth of the Ottoman Empire.

* Constantine XI, The last Byzantine Emperor and Roman Emperor. He lived from 1404 – 1453.

File: Constantine Palaiologos. jpg | Constantine XI

** Constantine XI, last Byzantine Emperor (" Last Roman Emperor ")

* February 9 – Constantine XI, last Byzantine Emperor ( d. 1453 )

* Constantine XI, as despotate of the Morea, invades the Latin Duchy of Athens and forces them to pay tribute, and return Thebes to Byzantium.

* October – Murad II invades Attica, forcing Constantine XI to return Thebes to the duchy of Athens and remove the tribute imposed in 1444.

* January 6 – Constantine XI is crowned Byzantine Emperor at Mistra.

* Constantine XI Dragases Palaiologos ( 8 February 1405 – 29 May 1453 ).

Constantine XI Palaiologos, Latinized as Palaeologus (, Kōnstantinos XI Dragasēs Palaiologos ; 8 February 1404 – 29 May 1453 ) was the last reigning Byzantine Emperor.

After his coronation, in 1451, Constantine XI sent a commission under George Sphrantzes asking Mara Branković, daughter of the Serbian Despot Đurađ Branković and Byzantine princess Irene Kantakouzene, by then the widow of Murad II, to marry him ( Maria had been allowed to return to her parents in Serbia after the death of Murad ).

Marble relief of a double-headed eagle in the Church of St Demetrios in Mystras, marking the spot where Constantine XI was crowned.

Desperate for any type of military assistance, Constantine XI appealed to the West reaffirming the union of Eastern and Roman Churches which had been signed at the Council of Florence, a condition the Catholic Church imposed before any help could be provided.

Before the beginning of the siege, Mehmed II made an offer to Constantine XI.

Some Eastern Orthodox and Greek-Catholics consider Constantine XI a saint ( or a national martyr or ethnomartyr, Greek: ).

* Great Martyr, the Emperor Blessed Constantine XI Paleologos

John VIII Palaiologos named his brother Constantine XI, who had served as regent in Constantinople in 1437 – 1439, as his successor.

After the death of his first consort, Maria of Tver ( 1467 ), and at the suggestion of Pope Paul II ( 1469 ), who hoped thereby to bind Russia to the Holy See, Ivan III wedded Sophia Paleologue ( also known under her original Greek and Orthodox name of Zoe ), daughter of Thomas Palaeologus, despot of Morea, who claimed the throne of Constantinople as the brother of Constantine XI, the last Byzantine emperor.

After the death of John VIII in 1448, Georgios entered the Pantokrator monastery in Constantinople under Constantine XI ( 1448 – 1453 ) and took, according to the invariable custom, a new name: Gennadius.

First married to Michael VII Doukas and secondly to Nikephoros III Botaneiates, she was preoccupied with the future of her son by Michael VII, Constantine Doukas.

# Theodora Komnene, who married ( 1 ) Constantine Kourtikes and ( 2 ) Constantine Angelos.

Another son had died at Brunanburh, and, according to John of Worcester, Amlaíb mac Gofraid was married to a daughter of Constantine.

But when, in early 1915, the Allies asked for Greek help in the Dardanelles campaign, offering Cyprus in exchange, their diverging views became apparent: Constantine had been educated in Germany, was married to Sophia of Prussia, sister of Kaiser Wilhelm, and was convinced of the Central Powers ' victory.

To back up an armistice signed with the Byzantine Empire in 1046, his father married him to Byzantine Anastasia ( d. 1067 ), who tradition holds was a daughter of Emperor Constantine IX Monomachos by his second wife ( he gained the Imperial throne through his third marriage ), but no reliable source has ever been found to confirm this.

Because he and his brother, the future Emperor Constantine VIII ( ruled 1025 – 1028 ), were too young to reign in their own right, Basil's mother Theophano married one of Romanos ' leading generals, who took the throne as the Emperor Nikephoros II Phokas several months later in 963.

As a youth, Constantine VIII had been engaged to a daughter of Emperor Boris II of Bulgaria, but in the end he married a Byzantine aristocrat named Helena.

Embarrassed by further failures, she and her supporters were supplanted in 919 by the admiral Romanos Lekapenos, who married his daughter Helena Lekapene to Constantine VII and finally advanced to the imperial throne in 920.

* Constantine Palaiologos ( 1261 – 1306 ), who married Eirene Raoulaina his second cousin

In May 919 he married his daughter Helena Lekapene to Constantine and was proclaimed basileopator (" father of the emperor ").

* Helena Lekapene, who married Emperor Constantine VII.

She was brought to Constantinople by Emperor Constantine V on 1 November 769, and was married to his son Leo IV on 17 December.

Consequently, Constantine VIII was forced to choose Theodora ’ s sister, Zoe, who married Romanos instead in 1028.

She eventually married Constantine IX Monomachos, on 11 June 1042, and the management of the empire reverted to him.

* Irene Doukaina Laskarina, who married Constantine I of Bulgaria

After the death of Thekla, in c. 823, Michael II married Euphrosyne, a daughter of Constantine VI and Maria of Amnia.

So in March 313 Licinius married Flavia Julia Constantia, half-sister of Constantine, at Mediolanum ( now Milan ); they had a son, Licinius the Younger, in 315.

Beginning in 307 already, he tried to arrange friendly contacts with Constantine, and in the summer of that year, Maximian traveled to Gaul, where Constantine married his daughter Fausta and was in turn appointed Augustus by the senior emperor.

Constantine reportedly married " a lady, descended from a noble Roman family ".

* Princess Anne-Marie Dagmar Ingrid ( born 1946 ), who married King Constantine II of the Hellenes ( later deposed ) in 1964.

To solidify his position, John married Theodora, a daughter of Emperor Constantine VII.