User blog:N E R O/Volterra

I have a question about the volturi in this wiki it says the volturi were born in a.d 450 but in breaking dawn Vladimir and Stephan said they've been waiting 1,500years for vengence and even in the new moon dirictor's book said the volturi have been alive for 2,000years so shouldn't the volturi been created in the 17,00's ?