Emperor before Caligula (8)

I believe the answer is:

tiberius

(Other definitions for tiberius that I've seen before include "Old tyrant" , "Roman emperor who succeeded Augustus" , "Tyrannical successor to Emperor Augustus, d. AD 19" , "Emperor at time of Crucifixion" , "Tyrannical successor to Emperor Augustus, d. AD 37" .)

I've seen this clue in the King Feature Syndicate.

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