Maty has a good section on the Julians in his book Sons of Caesar.
1) Julius Proculus, mentiond by Nephele, who claimed to have spoken with the spirit of Romulus
2) The family was among the leading clans that emigrated from Alba Longa to Rome
3) Appear as Consuls in the fifth century, one of whom dedicated a temple to Apollo
4) one mentioned as a decemvir
5) A Julius Caesar mentioned as a praetorian Governor of Sicily during the Second Punic War
6) during second century BCE, a number found as praetors
7) His uncle became a Consul and later Censor in the Social War, and his own father was a praetor