List four important and notable tasks that Emperor Constantine accomplished

He changed his official religion to Christianity.

Explanation:

Four important and notable tasks that Emperor Constantine accomplished are the following:

1.  He got victory in the civil war and become the sole emperor of the roman empire.

2. He gives legal rights to the christian that lived in his kingdom and at the end also accepted Christianity.

3. He also announced Christianity as the official religion of the empire.

4. He restructured the government and separate the civil and military authorities from the government affairs.

once he became head of state in 1915, venustiano (his name was not victoriano) carranza was able to implement some of his ideas, such as the drafting and the promulgation of the mexican constitution of 1917, which is still the current constitution of that country.