Charlie the reformed doctrine of predestination wrote by the Roman catholics.
The very people Jean Calvin went to war against
Reformed Doctrine of Predestination by Boettner, Loraine (1901-1990)
https://ccel.org/ccel/boettner/predest/predest.vii.ii.html?queryID=35330708&resultID=111914
Chapter XXVIII
Calvinism in History
1. Before the Reformation. 2. The Reformation. 3. Calvinism in England. 4. Calvinism in Scotland. 5. Calvinism in France. 6. Calvinism in Holland. 7. Calvinism in America. 8. Calvinism and Representative Government. 9. Calvinism and Education. 10. John Calvin. 11. Conclusion.
1. BEFORE THE REFORMATION
It may occasion some surprise to discover that the doctrine of Predestination was not made a matter of special study until near the end of the fourth century. The earlier church fathers placed chief emphasis on good works such as faith, repentance, almsgiving, prayers, submission to baptism, etc., as the basis of salvation. They of course taught that salvation was through Christ; yet they assumed that man had full power to accept or reject the gospel. Some of their writings contain passages in which the sovereignty of God is recognized; yet along side of those are others which teach the absolute freedom of the human will. Since they could not reconcile the two they would have denied the doctrine of Predestination and perhaps also that of God's absolute Foreknowledge. They taught a kind of synergism in which there was a co-operation between grace and free will.