| Theophylact | |
|---|---|
| Emperor of the Romans | |
&sq=&lang=&file=File:Byzantine_co-emperor.jpg) A young prince, most likely Theophylact, being crowned junior emperor by his father, miniature from the 12th century Madrid Skylitzes. | |
| Byzantine emperor | |
| Co-reign | 25 December 811 – 11 July 813 |
| Predecessor | Michael I Rangabe |
| Successor | Leo V the Armenian |
| Senior emperor | Michael I Rangabe |
| Born | c. 793 |
| Died | 15 January 849 Plate Island |
| Dynasty | Nikephorian dynasty |
| Father | Michael I Rangabe |
| Mother | Prokopia |
| Nikephorian dynasty | ||
|---|---|---|
| Chronology | ||
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| Succession | ||
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Theophylact or Theophylaktos (Greek: Θεοφύλακτος; c. 793 – 15 January 849) was the eldest son of the Byzantine emperor Michael I Rangabe (r. 811–813) and grandson, on his mother's side, of Nikephoros I (r. 802–811). He was junior co-emperor alongside his father for the duration of the latter's reign, and was tonsured, castrated, and exiled to Plate Island after his overthrow, under the monastic name Eustratius.