Theodora Tocco (née Maddalena Tocco) (died November 1429) was the first wife of Constantine Palaiologos while he was Despot of Morea. Her husband would become the last Emperor of the Eastern Roman Empire.
Maddalena Tocco was a daughter of Leonardo II Tocco, Lord of Zante. Her father was a younger brother of Carlo I Tocco, Count of Cephalonia and Leukas. Carlo would serve Ruler of Epirus from 1411 to 1429.
Carlo I was defeated at the Battle of the Echinades by John VIII Palaiologos in 1427. He had to withdraw from the parts of Elis under his control and relinquish his hereditary claims to Corinth and Megara. The agreement was sealed with the marriage of Maddalena to Constantine Palaiologos, younger brother of John VIII.
The marriage occurred in July 1428. She was converted to the Eastern Orthodox Church and took the name "Theodora". During their life together, Constantine held various territories of the Peloponnese under his control though still subordinate to both John VIII and Theodore II Palaiologos, Lord of Morea. Maddalena was thus consort to a minor ruler.
- Fine, John Van Antwerp Jr. (1994) . The Late Medieval Balkans: A Critical Survey from the Late Twelfth Century to the Ottoman Conquest. Ann Arbor, Michigan: University of Michigan Press. ISBN 0472082604. CS1 maint: discouraged parameter (link)
- Nicol, Donald M. (1993-10-29) . The Last Centuries of Byzantium, 1261-1453 (Second ed.). Cambridge University Press. ISBN 0-521-43991-4.
- Sphrantzes, George (June 1980). The Fall of the Byzantine Empire: A Chronicle by George Sphrantzes 1401-1477. Univ of Massachusetts Pr. ISBN 0-87023-290-8. CS1 maint: discouraged parameter (link)
- Zečević, Nada (2014). The Tocco of the Greek Realm: Nobility, Power and Migration in Latin Greece (14th-15th centuries). Belgrade: Makart. ISBN 9788691944100.