River that Caesar crossed (7)

I believe the answer is:

rubicon

(Other definitions for rubicon that I've seen before include "Point of no return (which Caesar crossed in 49BC)" , "Caesar crossed this river in an irreversible step" , "Caeser crossed this river in a decisive step- no going back" , "Polish picture depicting ancient" , "River crossed by Caesar in decisive move" .)

I've seen this clue in the Universal.

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