Eusebius of Caesarea

Paul's fellow workers and fellow soldiers, as he himself called them, numbered many thousands, the majority of whom he considered worthy of an everlasting memorial, for he has made his testimony to them enduring in his own letters. Moreover, Luke also, as he lists those known to him, makes mention of them by name. So Timothy is recorded as the first one called to oversee the church of Ephesus, just as Titus was for the churches in Crete.