Interjections, also called ejaculations, express emotion or sentiment so exclamation marks are generally used to punctuate them. Examples of interjections include "Ouch!", "Hey!", and "Aw!", along with filled pauses like "um" and "er", though those wouldn't be exclamations.
Answer:
Artemidorus.
Explanation: Artemidorus enters a street near the Capitol reading from a paper that warns Caesar of danger and that names each of the conspirators.