Augustine of Hippo
From ReformedWiki.org, the wiki for Reformed Christianity
Augustine of Hippo was a 5th century Christian theologian and apologist. His writings on grace, predestination, and human nature helped shape Reformed theology, and deeply influenced the Five Points of Calvinism. Augustine’s emphasis on God’s sovereignty and the concept of salvation by grace alone were foundational ideas later developed by Protestant Reformers, especially John Calvin, who regarded Augustine as a key source of theological insight.
