Constantine the Great believed that God showed him the cross in a dream that is the important thing . In the 4th century this would have been considered that God was saying they would win the battle maxenimus would be beaten and Constantine would rule the West This is what happened so yes if Constantine believed it , it is TRUE in those circumstances. If it happened today maybe the reply would be different

No I do not. Really why should we believe that God would give such a vision to such a man. It was not prophesied in the Bible. The account is not recorded in the Bible. Saul had a vision on the road to Damascus. That account is recorded in the Bible. Look at the impact that event had on his life, and the changes that Saul (Paul) made to adjust his life’s course to God’s Word. However, Constantine used his “vision” to cosolidate his political power. History does not show that Constantine took up a Christian lifestyle, or even got baptized. Constantine has been called a lot of things. “Christendom has added the expressions “saint,” “thirteenth apostle,” “holy equal of the apostles,” and ‘chosen by God’s Providence to accomplish the greatest turnabout in the whole world.’ At the other end of the spectrum, some describe Constantine as “bloodstained, stigmatized by countless enormities and full of deceit, . . . a hideous tyrant, guilty of horrid crimes.” Christendom has added the expressions “saint,” “thirteenth apostle,” “holy equal of the apostles,” and ‘chosen by God’s Providence to accomplish the greatest turnabout in the whole world.’ At the other end of the spectrum, some describe Constantine as “bloodstained, stigmatized by countless enormities and full of deceit, . . . a hideous tyrant, guilty of horrid crimes.” Here is his backround. In 313 C.E., Constantine arranged a partnership with Emperor Licinius, ruler of the eastern provinces. By means of the Edict of Milan, together they granted freedom of worship and equal rights to all religious groups. Many historians, however, downplay the significance of this document, saying that it was just a routine official letter and not a major imperial document signaling a change of policy toward Christianity. Within the next ten years, Constantine defeated his last remaining rival, Licinius, and became the undisputed ruler of the Roman world. In 325 C.E., as yet unbaptized, he presided over the first great ecumenical council of the “Christian” church, which condemned Arianism and drew up a statement of essential beliefs called the Nicene Creed. Constantine fell terminally ill in the year 337 C.E. At that late hour of his life, he was baptized, and then he died. After his death the Senate placed him among the Roman gods. Certainly, Constantine was a man of his era. At the beginning of his career, he needed some “divine” patronage, and this could not be provided by the fading Roman gods. The empire, including its religion and other institutions, was in decline, and something new and invigorating was needed to reconsolidate it. The encyclopedia Hidria says: “Constantine was especially interested in Christianity because it backed up not only his victory but also the reorganization of his empire. The Christian churches that existed everywhere became his political support. . . . He surrounded himself with the great prelates of the times . . . , and he requested that they keep their unity intact.” Constantine sensed that the “Christian” religion—albeit apostate and deeply corrupted by then—could be effectively utilized as a revitalizing and uniting force to serve his grand scheme for imperial domination. Adopting the foundations of apostate Christianity to gain support in furthering his own political ends, he decided to unify the people under one “catholic,” or universal, religion. Pagan customs and celebrations were given “Christian” names. And “Christian” clergymen were given the status, salary, and influential clout of pagan priests. Concerning Constantine, historian Paul Johnson states: “One of his main reasons for tolerating Christianity may have been that it gave himself and the State the opportunity to control the Church’s policy on orthodoxy and the treatment of heterodoxy.” Johnson notes: “Constantine never abandoned sun-worship and kept the sun on his coins.” The Catholic Encyclopedia observes: “Constantine showed equal favour to both religions. As pontifex maximus he watched over the heathen worship and protected its rights.” “Constantine never became a Christian,” states the encyclopedia Hidria, adding: “Eusebius of Caesarea, who wrote his biography, says that he became a Christian in the last moments of his life. This doesn’t hold water, as the day before, [Constantine] had made a sacrifice to Zeus because he also had the title Pontifex Maximus.” Sources cited and additional background information quoted from the March 15th, 1998 Watchtower, page 26

As Christian I have to believe it. He was the founder of today Christianity. If he didn’t tell the truth, he was a layer, how can a Christian believe in deity of Jesus because Constantine established this dogma. Thus, if you are a Christian and you believe in deity of Jesus you cannot say Constantine was a layer.