Constantine was a Roman ruler of the fourth century A.D

This column displays the emperor's military campaigns against the Dacians

A. Trajan's B. Quintilian's C. Pliny's D. Bearden's E. Odo's

The ________ was invented in 1816, enabling composers to indicate exactly the tempo they desired for any composition.

A. wristwatch B. valve C. metronome D. fortepiano