First post here.....
The SPQR books of John Maddox Roberts.
Hannibal's Children series by the above.
First Man in Rome series by Collen McCullough.
Gordinius the Finder series by Steven Saylor.
The Ancient City by Connolly.
Osprey series on the Roman Military and thier enemies.
Classical Warfare by Warry.
Most of the above are fiction, but what the hey, they're good reads.