Albert Barnes Commentary Acts 28:16

"And when we entered into Rome, Paul was suffered to abide by himself with the soldier that guarded him." — Acts 28:16 (ASV)

The captain of the guard. The commander of the Praetorian cohort, or guard. The custom was that those who were sent from the provinces to Rome for trial were delivered to the custody of this guard. The name of the prefect or captain of the guard, at this time, was Burrhus Afranius. Tacitus, Annals 12.42.1.

But Paul was suffered, etc. Evidently by the permission of the centurion, whose favor he had so successfully conciliated on the voyage. See Acts 27:43.

With a soldier that kept him. That is, in the custody of a soldier, to whom he was chained, and who, of course, constantly attended him. See Acts 24:23. See Barnes on Acts 12:6.