I actually thought you meant Jacob Arminius, the father of Arminians. He and John Calvin lived at the same time, and though Jacob Arrminius started out a Calvinist, and stayed a Calvinist, he changed his own beliefs a bit. Someone on google wrote what they thought were the differences. I'll post it here. I still like the teachings of John Wesley who leaned towards Arminianism:
1. Depravity
Calvinism says people are so depraved and rebellious that they are unable to trust God without his special work of grace to change their hearts so that they necessarily and willingly — freely — believe.
Arminians say, with regard to depravity, that people are depraved and corrupt, but they are able to provide the decisive impulse to trust God with the general divine assistance that God gives to everybody.
2. Election
Calvinism says that we are chosen. God chooses unconditionally whom he will mercifully bring to faith and whom he will justly leave in their rebellion.
Arminians say God has chosen us — elected to bring to salvation — all those whom he foresaw would believe by bringing about their own faith and providing the decisive impetus themselves. In those, God doesn’t decisively produce the faith that he foresees.
3. Atonement
Calvinism says that in the death of Christ, God provided sufficient atonement for all but designed that it be effective for the elect — meaning that Christ’s death purchased for them the new-covenant promise that God would bring about in his people faith and perseverance.
Arminians say that in the death of Christ, God provided sufficient atonement for all and designed that it would become effective by virtue of faith for which we — not Christ — provide the decisive impetus. Meaning, faith itself is not purchased by the cross, but that it is the human means of obtaining what the cross purchased — namely, forgiveness of sins.
4. New Birth
Calvinists say that the new birth is God’s work of renewal in our hearts that necessarily brings about the act of willing, hearty, saving faith.
Arminians say the new birth is God’s work of renewal in our hearts in response to our act of saving faith.
5. Perseverance
Calvinists say God works infallibly to preserve us in faith — all of us who are truly born again — and that no one is ever lost who was truly born of God.
Arminians say God works to preserve his people, but he does not always prevent some who were born again from falling away to destruction.