From the martyrology:
"The birthday of St. Matthew, Apostle and Evangelist, who suffered martyrdom in Ethiopia, while engaged in preaching. The Gospel written by him in Hebrew was, by his own revelation, found in the time of the emperor Zeno, together with the relics of the blessed apostle Barnabas."
A former tax collector, St Matthew was of course one of the twelve apostles and, modernist speculation aside, author the Gospel bearing his name. Some of the early Fathers suggest that he originally wrote his Gospel in Hebrew rather than the Greek that was the lingua franca of the time. But if so that version has not come down to us.