Civilization V: Who/What Am I?

AI demand that you move forces near their border away.
 
No. Okay, last clue should give it out.
Clue#1: Split
Clue #2: Occupatio
Clue #3: 476 AD
 
Since i'm 100% sure i'm right let's start on the next clue.
#1 I am the first unit that can go on ocean tiles.
 
Both of you are close... but need to be more specific.
 
To bad we can't ques again, it's against the rules. Either we have to wait 24 h or you have to give us a new clue.

(Can we really continue this game without the older riddle answered?)

I don't think the OP will mind i was right anyway. What else happened in 476 that match the clues.
 
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