Ymerawdwr Caergystennin o 11 Rhagfyr 969 tan 10 Ionawr 976 oedd Ioan I Tzimiskes (Groeg: Ιωάννης Τζιμισκής, Iōannēs I Tzimiskēs) (tua 925 – 10 Ionawr 976).
| Ioan I Tzimiskes | |
|---|---|
 | |
| Ganwyd | c. 925  Caergystennin |
| Bu farw | 10 Ionawr 976 o clefyd Caergystennin |
| Dinasyddiaeth | yr Ymerodraeth Fysantaidd |
| Galwedigaeth | llywodraethwr |
| Swydd | Ymerawdwr Bysantaidd |
| Priod | Theodora |
| Plant | Theophano Kourkouas |
| Llinach | Macedonian dynasty |
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