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Easton's Bible Dictionary
The city of Philippi was a Roman colony (Acts 16:12
), i.e., a military settlement of Roman soldiers and citizens, planted there to keep in subjection a newly-conquered district. A colony was Rome in miniature, under Roman municipal law, but governed by military officers (praetors and lictors), not by proconsuls. It had an independent internal government, the jus Italicum; i.e., the privileges of Italian citizens.
These dictionary topics are from M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition, published by Thomas Nelson, 1897. Public Domain.
Easton, Matthew George. Entry for 'Colony'. Easton's Bible Dictionary. https://www.studylight.org/dictionaries/eng/ebd/c/colony.html. 1897.