What was the most common resource used during the 1st I. R.

The main resource used to produce energy during the Industrial Revolution was coal.

Explanation:

the story goes that because of this belief, constantine was able to defeat his foes. constantine became an ardent1 christian. christianity and other religions were tolerated under constantine's rule. constantine also was responsible for the building of a great cathedral in rome.

should be the answer hope this