What subjects did John Milton examine in De Doctrina Christiana?

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Engraved portrait of John Milton by Jacob Houbraken, showing Milton with shoulder-length hair, a lace collar, and period clothing, facing forward in an oval frame. — John Milton John Milton, engraving by Jacob Houbraken, 1741.

In De Doctrina Christiana ("On Christian Doctrine"), John Milton presents a comprehensive and systematic theology derived from his close engagement with Scripture.1

The work examines several key subjects, including:

The Godhead: Milton utilizes numerous biblical proof texts to support his specific concepts regarding the nature of the Godhead.1
Moral Theology: The treatise explores principles of moral theology and Christian conduct.1
Theological Doctrine: Reflecting his engagement with Protestant thinkers, Milton addresses various doctrinal points, notably tending to subordinate the Son to the Father and opposing the trinitarian orthodoxy traditionally associated with Roman Catholicism.1

Although the work is highly derivative—drawing on the ideas of Reformed theologians like John Wolleb and English Puritans such as William Perkins and William Ames—it remains an unfinished manuscript that highlights Milton's independent theological inquiry.1