Didymus the Blind
Theologian and head of the Catechetical School of Alexandria, despite being blind from infancy. Jerome traveled to Alexandria specifically to consult him on questions of Scripture.
Preface and Praise of Sacred Scripture
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Chapter IV: The Judgments and Examples of the Fathers
— Jerome studied under him
"Jerome studied under Gregory Nazianzen and Didymus"
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The Fathers' Defense of the Old Testament
— Jerome went to Alexandria specifically to see Didymus and consult him about doubts in Scripture
"I went to Alexandria, to see Didymus and to consult him about all the doubts"