A city on the coast of Mysia, in the north-west of Asia Minor, named after ancient Troy, which was at some little distance from it (about 4 miles) to the north. Here Paul, on his second missionary journey, saw the vision of a “man of Macedonia,” who appeared to him, saying, “Come over, and help us” (Acts 16:8-11). He visited this place also on other occasions, and on one of these visits he left his cloak and some books there (2 Cor. 2:12; 2 Tim. 4:13). The ruins of Troas extend over many miles, the site being now mostly covered with a forest of oak trees. The modern name of the ruins is Eski Stamboul i.e., Old Constantinople.
Troas
Troas was a port city on the coast, and Paul kept passing through it. On his second journey, a call to go to Macedonia came to him from there, and he sailed straight on. Later he writes that a door was opened to him there “to preach Christ’s gospel,” and on another visit the company stayed seven days. Near the end of his life he asks Timothy to bring the cloak he left behind with Carpus, and especially the parchments. Acts 20 gives you the longest stay in the city.
6 verses
Acts
And they passing by Mysia came down to Troas.
Therefore loosing from Troas, we came with a straight course to Samothracia, and the next day to Neapolis;
These going before tarried for us at Troas.
And we sailed away from Philippi after the days of unleavened bread, and came unto them to Troas in five days; where we abode seven days.
2 Corinthians
Furthermore, when I came to Troas to preach Christ's gospel, and a door was opened unto me of the Lord,
2 Timothy
The cloke that I left at Troas with Carpus, when thou comest, bring with thee, and the books, but especially the parchments.
From Easton's Bible Dictionary
Matthew George Easton, 1897