legatus
A Mercenary
Private First Class or "Rookie".
cavalryman, but he/she might have another name that his/her parents and or his/her friends call him/her. hussar, dragoon, cuirassier, carabinier, uhlan are all types of cavalryman. There are more...
Julius Sneezer.
Constantine made Christianity a legal religion in the Roman Empire. He also moved the capitol of the Roman Empire from Rome to Constantinople (modern day Istanbul).
A soldier in charge of one hundred soldiers is typically referred to as a "captain." In military hierarchy, a captain usually commands a company, which can consist of around 100 to 200 soldiers, depending on the branch of service and specific organizational structure.
Scutum - is the Roman soldiers' shield
He would call it his gladius, his sword, his weapon. I'm not aware of any Roman soldier actually giving his sword a name. If you find out differently, let me know.
Centurian
A centurion
A c-note is a nickname for a hundred dollar bill. The "c" in c-note stands for "century," which is another word for a hundred. This term likely originated from the Roman numeral "C" for 100.
If this has something to do with Greek and Roman Myths, they're called Hekatoncheires, or the Hundred-Handed Ones.
A sentry is a name for a soldier on guard.
A centurion
There is no difference, well, if you know what I mean. You a male a soldier and you call a female a soldier.
A soldier
Sentry