Signs and wonders - - They seem to be part of numerous institutionalized superstition/mythological based belief systems.
Constantine ruled for 30yrs, you dont survive that long lest you be a very shrewd operator.
Constantine had three sons and had them educated- tutored by certain eteemed christians appointed to his court. When he gave up his position as ruler he appointed his three sons as Augusti and two nephews as Caesars. The sons made short work of the nephews and one son killed the other... ruthless dynastic family christians at work.
He was a shrewd and ruthless operator. Apparently he had God on his side.