Roman civilization began in 509 bc and ended in 985 bc years later. what year was that?

The

the main rule is shown on this line:
                                       
           BC years                            birth of christ                         AD years
985bc   509bc     3bc       2bc     1bc        0
---//// //////Now

-985     -509        -3         -2       -1           0       1       1900   2017

looking at this image of time the year was at -985 

I think that the idea is something like this:
- 509 + 985 = 476
So the question must be: " Roman civilization began in 509 BC and ended in 985 years later ( not 985 BC years later, it does not have a sense )".

Roman civilization ended in 476 AD ( and it is historically true ).