I want to know the answer to the following question:
What did Constantine the Great and Licinius pass to introduce toleration of Christianity in the Roman Empire?
All the background I'm provided with is that "To put an end to the doctrinal debate initiated by Arius, Constantine called the first of what would afterwards be called the ecumenical councils and then enforced orthodoxy by Imperial authority.". Is that enough to answer the question?
Answer: no