Dictionary
Colony
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.
Dictionary
Freedom
The law of Moses pointed out the cases in which the servants of the Hebrews were to receive their freedom (Ex. 21:2-4, 7, 8; Lev. 25:39-42, 47-55; Deut. 15:12-18). Under the Roman law the "freeman" (ingenuus) was one born free; the "freedman" (libertinus) was a manumitted slave, and had not equal rights with the freeman (Acts 22:28; comp. Acts 16:37-39; 21:39; 22:25; 25:11, 12).
Dictionary
Appii Forum
I.e., "the market of Appius" (Acts 28:15, R.V.), a town on the road, the "Appian Way," from Rome to Brundusium. It was 43 miles from Rome. Here Paul was met by some Roman Christians on his way to the capital. It was natural that they should halt here and wait for him, because from this place there were two ways by which travellers might journey to Rome.