Late Roman Christian Ring with Chi Rio Symbol 4th,5th Century AD

A solid bronze ring with a O sectioned band and hearth shaped bezel decorated with Chi Rio symbol, smooth dark patina; 5.15 grams, 18.35 mm max internal diameters, 24.25 mm max external diameter.Very fine condition. From the collection of a London gentleman; acquired 2000’s on the EU art market. History says that the Chi Rho symbol manifested itself to Constantine in a vision before he fought the Battle of the Milivian Bridge outside Rome in 312 AD. The emperor then had the symbol engraved on the shields of his soldiers. After winning the battle, Constantine legalized the religion of Christianity across his empire.