So Arminius was not an Arminian.
IIRC Arminus’ theology was consistent with the Heidelburg Confession but not with the more strict Calvinist positions as set forth in the Westminster Confession.
Actually, the arminianism we know is the product of arminius’ followers after his death, the remonstrants. Personally, I don’t think he would have gone where they went. Every time he went before a tribunal he came out in the clear. They didn’t defrock him. Those later followers were repudiated.
DrE, if she were still here, would probably argue with me the fine points of this, but the fact remains that Arminus never wanted to leave and his opponents were never able to get him kicked out.
I think he was Heidelberg instead of Westminster, but I’ve never been able to tell the difference.