Ufilas was a arian bishop sent as a missionary to the goths he invented the gothic language and oversaw the team that translated for the first gothic bible. His adopted son Auxentius was expelled from his original post by Theodosius edict against the unitarian bishops. Auxentius went to Milan where he was in ongoing conflict with the trinitarian bishop Ambrose. According to Auxentius writings Ufilas had his own creed that offers us a window into Gothic Christianity before the goths transitioned to catholicism in 589 AD.
I, Ulfila, bishop and confessor, have always so believed, and in this, the one true faith, I make the journey to my Lord; I believe in one God the Father, the only unbegotten and invisible, and in his only-begotten son, our Lord and God, the designer and maker of all creation, having none other like him so that one alone among all beings is God the Father, who is also the God of our God; and in one Holy Spirit, the illuminating and sanctifying power, as Christ said after his resurrection to his apostles: "And behold, I send the promise of my Father upon you; but tarry ye in the city of Jerusalem, until ye be clothed with power from on high" (Luke 24:49) and again "But ye shall receive power, when the Holy Ghost is come upon you" (Acts 1:8); being neither God (the Father) nor our God (Christ), but the minister of Christ... subject and obedient in all things to the Son; and the Son, subject and obedient in all things to God who is his Father... (whom) he ordained in the Holy Spirit through his Christ.