Maybe the most understood and enduring bit of Constantine's political portfolio is the 325 Chamber of Nicaea, a social occasion of around 300 clerics issuing an official articulation confirming Jesus Christ as totally celestial. This announcement of confidence is known as the forerunner to today's still popular Nicene Statement of faith. Indeed, Constantine put his political weight behind this belief, and the world still feels his impact. For example, I live in a somewhat residential community, yet I wouldn't need to go extremely far on a Sunday morning before I'd keep running into a Christian church showing the Nicene Statement of faith or citing it as an assemblage.
I usually ask my teacher what specific things to study and although you already know what to study, they will usually tell you things that you can study that are prevalent on the test.