Wani sanannen koyaswar kiristanci wanda ba sa bin kiristanci wanda ya bazu ko'ina cikin daular Roma tun daga karni na 4 zuwa gaba shine Arianism, wanda shugaban Kirista Arius ya kafa daga Iskandariya,Masar , wanda ya koyar da cewa Yesu Kiristi wani halitta ne da ya bambanta da kuma yana karkashin Allah Uba.Tiyolojin Arian ya ɗauka cewa Yesu Kiristi Ɗan Allah ne, wanda Allah Uba ne ya haife shi da bambancin cewa Ɗan Allah ba koyaushe yake wanzuwa ba amma Allah Uba ne ya haife shi cikin lokaci, saboda haka Yesu ba ya kasance tare da Allah na har abada. Uban.Ko da yake an yi Allah wadai da koyarwar Arian a matsayin bidi’a kuma daga baya cocin daular Roma ta kawar da shi, ya kasance sananne a ƙarƙashin ƙasa na ɗan lokaci.A ƙarshen karni na 4, an nada Ulfilas, bishop na Arian Roman, a matsayin Kirista na farko na mishan zuwa Goths, al'ummar Jamusawa a yawancin Turai a kan iyakokin da kuma cikin daular Roma.Ulfilas ya yada Kiristanci na Arian a cikin Goths, yana tabbatar da bangaskiya a tsakanin yawancin kabilun Jamus, don haka ya taimaka wajen kiyaye su a al'ada da addini daga Kiristanci na Chalcedonia.