Marius the Epicurean (1885) by Walter Pater is a philosophical and semi-autobiographical novel set in the Roman Empire during the reign of Marcus Aurelius. It follows the intellectual and spiritual journey of Marius, a sensitive and thoughtful young Roman who seeks meaning in life through art, philosophy, and religion.

Initially drawn to Epicureanism, Marius pursues beauty and personal serenity as guiding principles. However, he becomes increasingly disillusioned with its limitations. Over time, he explores Stoicism, Platonism, and early Christianity, all while observing the decline of pagan Rome and the stirrings of a new spiritual world.

The novel is less about plot and more about inner transformation-a meditation on how one might live a good and beautiful life. Ultimately, Marius does not convert to Christianity but comes to admire its ideals, dying quietly in pursuit of a moral, reflective, and compassionate life.

Pater's richly aesthetic style and emphasis on sensibility, moral choice, and the soul's development make this a landmark work in English Decadent literature.