Theodore I Palaiologos, Lord of Morea
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Theodore I Palaiologos (c. 1355 – 24 June 1407) was despot (despotēs) in the Morea from 1383 until his death on June 24, 1407. He was the youngest surviving son of the Byzantine Emperor John V Palaiologos
John V Palaiologos
John V Palaiologos was a Byzantine emperor, who succeeded his father in 1341, at age nine.-Biography:...

 and his wife Helena Kantakouzene. His maternal grandfather was former Emperor John VI Kantakouzenos
John VI Kantakouzenos
John VI Kantakouzenos or Cantacuzenus was the Byzantine emperor from 1347 to 1354.-Early life:Born in Constantinople, John Kantakouzenos was the son of a Michael Kantakouzenos, governor of the Morea. Through his mother Theodora Palaiologina Angelina, he was a descendant of the reigning house of...

. His older brothers were Emperor Andronikos IV Palaiologos
Andronikos IV Palaiologos
Andronikos IV Palaiologos was Byzantine Emperor from 1376 to 1379.-Life:...

 and Manuel II Palaiologos
Manuel II Palaiologos
Manuel II Palaiologos or Palaeologus was Byzantine Emperor from 1391 to 1425.-Life:...

.

In 1376 Theodore I Palaiologos, already named despotēs, was charged with governing Thessalonica by his father John V, but before he could take possession of the city, he was arrested and imprisoned together with his father and his brother Manuel by his eldest brother Andronikos IV. This captivity lasted throughout Andronikos' usurpation, from 1376 until 1379. Soon after the restoration of John V, Manuel was appointed to rule in Thessalonica, and Theodore was eventually transferred to Morea.

The Morea had remained in the hands of Manuel Kantakouzenos
Manuel Kantakouzenos
Manuel Kantakouzenos , . Despotēs in the Despotate of Morea or the Peloponnese from October 25, 1349 to his death and a contender to the Principality of Achaia.Kantakouzenos was the second son of Emperor John VI Kantakouzenos and Irene Asanina...

, a younger son of Emperor John VI, even after the latter's abdication in 1354. Manuel died in 1380 and was succeeded by his older brother, the former co-emperor Matthew Kantakouzenos
Matthew Kantakouzenos
Matthew Kantakouzenos or Cantacuzenus was Byzantine Emperor from 1353 to 1357.-Life:...

, who died or retired in 1383. By this time Theodore was appointed to rule the Morea (in 1382), but Matthew was briefly succeeded by his son perhaps Demetrios I Kantakouzenos. Theodore I Palaiologos arrived in the Morea in 1383 and successfully took possession of the province.

The young despotēs soon commenced wars for the expansion of his province. His military campaigns were arguably the most successful Byzantine military operations since the annexation of large regions of Thessaly
Thessaly
Thessaly is a traditional geographical region and an administrative region of Greece, comprising most of the ancient region of the same name. Before the Greek Dark Ages, Thessaly was known as Aeolia, and appears thus in Homer's Odyssey....

 and Epirus
Epirus
The name Epirus, from the Greek "Ήπειρος" meaning continent may refer to:-Geographical:* Epirus - a historical and geographical region of the southwestern Balkans, straddling modern Greece and Albania...

 by his paternal grandfather Andronikos III Palaiologos
Andronikos III Palaiologos
Andronikos III Palaiologos, Latinized as Andronicus III Palaeologus was Byzantine emperor from 1328 to 1341, after being rival emperor since 1321. Andronikos III was the son of Michael IX Palaiologos and Rita of Armenia...

 earlier in the 14th century. In order to increase the potential manpower of his army, Theodore encouraged the settlement of Albanians in Morea, and recruited them as troops against local landowners, the Latin possessions surrounding his province, and against the encroaching Ottomans
Ottoman Empire
The Ottoman EmpireIt was usually referred to as the "Ottoman Empire", the "Turkish Empire", the "Ottoman Caliphate" or more commonly "Turkey" by its contemporaries...

.

Theodore's first successes came in 1388, soon followed by his conquest of Argos
Argos
Argos is a city and a former municipality in Argolis, Peloponnese, Greece. Since the 2011 local government reform it is part of the municipality Argos-Mykines, of which it is a municipal unit. It is 11 kilometres from Nafplion, which was its historic harbour...

. However the Republic of Venice
Republic of Venice
The Republic of Venice or Venetian Republic was a state originating from the city of Venice in Northeastern Italy. It existed for over a millennium, from the late 7th century until 1797. It was formally known as the Most Serene Republic of Venice and is often referred to as La Serenissima, in...

 intervened and took control of Argos from him while also offering protection to Patras
Patras
Patras , ) is Greece's third largest urban area and the regional capital of West Greece, located in northern Peloponnese, 215 kilometers west of Athens...

. The situation was resolved with the signing of a military alliance between Morea and Venice in 1394. Bayezid I
Bayezid I
Bayezid I was the Sultan of the Ottoman Empire, from 1389 to 1402. He was the son of Murad I and Valide Sultan Gülçiçek Hatun.-Biography:Bayezid was born in Edirne and spent his youth in Bursa, where he received a high-level education...

 of the Ottoman Empire
Ottoman Empire
The Ottoman EmpireIt was usually referred to as the "Ottoman Empire", the "Turkish Empire", the "Ottoman Caliphate" or more commonly "Turkey" by its contemporaries...

 was starting to expand his control over the Balkans
Balkans
The Balkans is a geopolitical and cultural region of southeastern Europe...

 and both rivals for control over the Peloponnese
Peloponnese
The Peloponnese, Peloponnesos or Peloponnesus , is a large peninsula , located in a region of southern Greece, forming the part of the country south of the Gulf of Corinth...

 had to defend it against a possible invasion by the Ottomans. The new alliance was accompanied by a decision to build a fortification wall across the Isthmus of Corinth
Isthmus of Corinth
The Isthmus of Corinth is the narrow land bridge which connects the Peloponnese peninsula with the rest of the mainland of Greece, near the city of Corinth. The word "isthmus" comes from the Ancient Greek word for "neck" and refers to the narrowness of the land. The Isthmus was known in the ancient...

.

The military genius of Theodore would soon become evident. Not only did he defeat invading Ottoman forces but successfully counter-attacked and conquered both Corinth
Corinth
Corinth is a city and former municipality in Corinthia, Peloponnese, Greece. Since the 2011 local government reform it is part of the municipality Corinth, of which it is the seat and a municipal unit...

 (1395) and Athens
Athens
Athens , is the capital and largest city of Greece. Athens dominates the Attica region and is one of the world's oldest cities, as its recorded history spans around 3,400 years. Classical Athens was a powerful city-state...

 (1396). His victories attracted the attention of Bayezid I who started considering him a dangerous opponent. Bayezid personally led a full military invasion against the Morea.

Unlike his older brother Manuel II, Theodore did not attempted to submit and continued to fight till the end. When he was no longer able to prevent Mystras
Mystras
Mystras is a fortified town and a former municipality in Laconia, Peloponnese, Greece. Since the 2011 local government reform it is part of the municipality Sparti, of which it is a municipal unit. Situated on Mt...

 and Corinth from falling to Ottoman control, Theodore instead offered both cities (Corinth in 1397, Mystras in 1400) to the Knights Hospitaller
Knights Hospitaller
The Sovereign Military Hospitaller Order of Saint John of Jerusalem of Rhodes and of Malta , also known as the Sovereign Military Order of Malta , Order of Malta or Knights of Malta, is a Roman Catholic lay religious order, traditionally of military, chivalrous, noble nature. It is the world's...

 of Rhodes
Rhodes
Rhodes is an island in Greece, located in the eastern Aegean Sea. It is the largest of the Dodecanese islands in terms of both land area and population, with a population of 117,007, and also the island group's historical capital. Administratively the island forms a separate municipality within...

. This ensured their continued resistance to the Ottomans even when not under his own control.

In the end his methods proved successful. Bayezid I declared the Peloponnese an Ottoman province but failed to fully establish his control before calling off his campaign and returning to his capital in Edirne
Edirne
Edirne is a city in Eastern Thrace, the northwestern part of Turkey, close to the borders with Greece and Bulgaria. Edirne served as the capital city of the Ottoman Empire from 1365 to 1453, before Constantinople became the empire's new capital. At present, Edirne is the capital of the Edirne...

. Theodore soon managed to restore his control in Morea and most of his former conquests. The Knights Hospitaller even returned to him Mystras and Corinth once their forces were no longer needed to secure the area, in 1404.

In 1400, Bayezid I had turned his attention to Constantinople and was besieging the city. Manuel II managed to escape his capital along with most of the Imperial family. He set out in person to seek help from the forces of Western Europe
Western Europe
Western Europe is a loose term for the collection of countries in the western most region of the European continents, though this definition is context-dependent and carries cultural and political connotations. One definition describes Western Europe as a geographic entity—the region lying in the...

. Meanwhile he left his family in the protection of Theodore. Theodore secured his visiting kin in his new provincial capital in Monemvasia
Monemvasia
Monemvasia is a town and a municipality in Laconia, Greece. The town is located on a small peninsula off the east coast of the Peloponnese. The peninsula is linked to the mainland by a short causeway 200m in length. Its area consists mostly of a large plateau some 100 metres above sea level, up to...

.

Theodore I had married Bartolomea Acciaioli, a daughter of Duke Nerio I Acciaioli
Nerio I Acciaioli
Nerio I Acciaioli was as Italian aristocrat from Florence who rose to power in Frankish Greece during the last decades of the fourteenth century, eventually becoming Duke of Athens....

 of Athens
Duchy of Athens
The Duchy of Athens was one of the Crusader States set up in Greece after the conquest of the Byzantine Empire during the Fourth Crusade, encompassing the regions of Attica and Boeotia, and surviving until its conquest by the Ottoman Empire in the 15th century....

 but is not known to have sons. Shortly before his death, Theodore took monastic orders under the name "Theodoret", and died on June 24, 1407. The succession problem caused by his death was resolved when Manuel II named his own underage son Theodore II Palaiologos as the new despotēs of the Morea.

Some sources consider an unnamed daughter of Theodore to be the wife of Suleyman Çelebi, the Edirne Sultan during the Ottoman Interregnum
Ottoman Interregnum
The Ottoman Interregnum began in 20 July 1402, when chaos reigned in the Ottoman Empire following the defeat of Sultan Bayezid I by the Turco-Mongol warlord Timur...

. There are no known descendants of Suleyman.

Ancestry

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