He undertook the reform of the ecclesiastical chant of the Divine Office and achieved distinction as a writer of prose and poetry.
Eugenius left two books in prose and verse, containing his poems on religious and secular subjects, his recension of the poem of Dracontius on "The Six days of Creation", to which he added a "Seventh Day", and a letter to King Chindaswinth explaining the plan of the entire work.
Of this work Bardenhewer says that it "underwent a substantial revision at the hands of Eugenius II, Bishop of Toledo, in keeping with the wish of the Visigothic King Chindaswinth; not only were the poetical form and the theology of the poem affected by this treatment, but probably also its political sentiments.
It is this revision that was usually printed as Dracontii Elegia, until the edition of Arévalo (Rome, 1791, 362-402, and 901-32) made known the original text".
Ferrera mentions a letter of Eugenius to the king and one to Protasius, the Metropolitan of Tarragona, promising if possible to write a mass of St. Hippolytus and some festal sermons, but disclaiming the ability to equal his former productions.