What important change did the roman emperor constantine make in
a. d. 313?
a. he divided the empire into two parts, eastern and western.
b. he brought back the republic to end political violence.
c. he granted religious toleration to christians.
d. he moved the capital of the empire to vienna.

i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.