Acts 16:12-13

And from thence to Philippi. Only a few miles distant. They sought it at once, because it was "the chief city of that part of Macedonia". The apostles tried to leaven the centers of influence with the Gospel. The city had been rebuilt about 400 years before this by Philip, the father of Alexander the Great, who named it after himself. It was famous as the place of the decisive battle between Brutus and Cassius on the one hand, and Mark Antony and Octavius, afterwards Augustus Caesar, upon the other.

A colony. A Roman colony was a settlement of Romans in a foreign country, with all the privileges of Romans. The colony had its own senate, its own magistrates, observed all the Roman forms, and was a miniature Rome. This colony had been established by Caesar Augustus, who settled at this place a multitude of the partisans of his rival, Mark Antony, after the death of the latter. Philippi is now a small village named Filiba.
Went out . . . by a river side. The Ganges, a small river which flows by the city.

Where prayer was wont to be made. Where there was a praying place. There seems to have been no synagogue, but a few pious Jews, women at least in great part, met on the river banks, out of the city, for prayer.

Spake unto the women. Either Jewish women, or proselytes to the Jewish faith.
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