 First-generation Reformed theologians include Huldrych Zwingli (1484–1531), Martin Bucer (1491–1551), Wolfgang Capito (1478–1541), John Oecolampadius (1482–1531), and Guillaume Farel (1489–1565).These reformers came from diverse academic backgrounds, but later distinctions within Reformed theology can already be detected in their thought, especially the priority of scripture as a source of authority.Scripture was also viewed as a unified whole, which led to a covenantal theology of the sacraments of baptism and the Lord's Supper as visible signs of the covenant of grace.