1 At Caesarea there was a man named Cornelius, a centurion in what was known as the Italian Regiment. 2 He and all his family were devout and God-fearing; he gave generously to those in need and prayed to God regularly. (NIV)
My understanding is that Roman soldiers of this period (Augustus through to Septimus Severus [193-211 CE]) were prohibited from marrying [“The men serving in the army, since they could not legally have wives, were granted the privileges of married men.” Cassius Dio 60.24.3]
This raises the question who are the οἴκῳ of verse 2? Are these an illicit family, thus raising questions of “devout and God-fearing;” or are they merely servants and retainers? If the former does indicate that since such non-married living and family arrangements were unofficially sanctioned by Rome, that Cornelius’ situation was an application of Acts 17:30 being in play, that his ignorance was overlooked until his repentance?