Constantine's actual influence in Europe was limited to some skirmish or other with the Goths unless I am seriously misremembering, and the Goths in fact were the longest holdouts of all the European tribes in accepting Christianity, finally getting Christianized around the year 1000.
I'm afraid you are misremembering.
The goths were among the first barbarian tribes to convert to Christianity around the 3rd and 4th centuries. The honor of being the last to convert at around 1000 AD belongs to Scandanavian Vikings
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Constantine was sole emperor of the Roman Empire from 324-337 AD, which was not significantly smaller than at its territorial height under Trajan. The Roman Empire at the time still included Britain, Spain, France, North Africa, Palestine, Turkey, Greece, the area once known as Yugoslavia, and the Mediterranian. As sole emperor, Constantine had a significant influence upont these areas.
Constantine I (306 – 337 A.D.) – Roman Emperors – An Online Encyclopedia of Roman Rulers and Their Families
And there was no Roman empire in Europe after Constantine anyway.
Constantine died in 337. The Western Roman Empire ceased to exist 140 years later in 476. The Eastern Roman (Byzantine) Empire ceased to exist 980 years later in 1453. Both Western and Eastern Empires were at least partially in Europe during the entire time.
Please rely on reputable sources instead of faith in faulty memories when making assertions.
Edited by anglagard, : Speling