TROGYLLIUM (trō-jĭl'ĭ-ŭm, Gr. Trōgyllion). The phrase in which Trogyllium is mentioned in Acts.20.15 (jb, kjv, mof) is the occasion of some textual—but no geographical—difficulty (see W. M. Ramsay, The Church in the Roman Empire, p. 155). Trogyllium is a slender promontory thrusting SW from the Asian mainland north of Miletus and overlapping the eastern extension of Samos. The narrow strait forms a protected roadstead in which a small coasting vessel would naturally await suitable wind conditions on the last lap to Miletus. NIV omits the name altogether; RSV also omits it but adds the footnote, “Other ancient authorities add after remaining at Trogyllium.”

TROGYLLIUM trō jĭl’ ĭ əm (Gr. Τρωγύλλιον, G5591). Some twenty m. S of Ephesus, a high headland N of the mouth of the Maeander forms a sharply pointed cape protruding westward, and makes a narrow channel between the mainland and the island of Samos. This waterway forms a protected roadstead in which a coasting vessel might naturally pass the night before running across the open gulf to Miletus. This promontory is called Trogyllium. The strait is barely a m. wide. The pause in the protected anchorage is mentioned in Acts 20:15, and the v. is subject to some textual difficulties summarized in the critical note in EGT, vol. 2, 428. RSV omits “after remaining at Trogyllium,” merely noticing the words in a footnote. W. M. Ramsay discusses the text in two places (The Church in the nodetitle, 155; Saint Paul the Traveller and Roman Citizen, 293, 294). The reading must be left to the adjudication of Lower Criticism, but the disputed phrase occasions no difficulty geographically or historically. There is evidence of a town on the promontory, and an anchorage is traditionally known as Paul’s Port.

International Standard Bible Encyclopedia (1915)

tro-jil’-i-um, tro-gil’-i-um (Trogullion): According to Ac 20:15 the King James Version, the American Revised Version margin, the ship in which Paul sailed to Caesatea on his return from his 3rd missionary journey tarried at Trogyllium. Several of the early manuscripts omit the words, "tarried at Trogyllium" (Westcott and Hort omit as "Western" interpolation); yet, whether the words belonged to the text or not, Paul evidently passed the promontory, and probably stopped there. From the coast near Miletus the promontory projects into the sea toward the island of Samos; the strait separating the mainland from the island is scarcely a mile wide. It was in this strait which is now called Kutchuk Boghaz by the Turks that the battle of Mycale was fought in 479 BC. The promontory now bears the name of Santa Maria, and the place of anchorage is called Saint Paul’s port.