What is "trophimus"

Trophimus (, Trophimos) or Trophimus the Ephesian , Trophimos ho Ephesios) was a Christian who accompanied Paul during a part of his third missionary journey. He was with Paul in Jerusalem, and the Jews, supposing that the apostle had brought him into the temple, raised a tumult which resulted in Paul’s imprisonment. (See Herod's Temple). In writing to Timothy, the apostle comments that he left Trophimus in Miletus due to illness. This must refer to some event not noticed in the Acts.