Theodosius I (disambiguation)
Theodosius I (347–395) was Roman Emperor from 379 to 395.
Theodosius I may also refer to:
- Pope Theodosius I of Alexandria (died 567), Patriarch of Alexandria, 535–567
- Theodosius I of Constantinople, (died after 1183), Ecumenical Patriarch of Constantinople, 1179–1183
- Teodósio I, Duke of Braganza (1510–1563), Portuguese duke
- Theodosius (disambiguation), a given name, including a list of people with that name
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