ISB ~ 1 Peter 5 v13

She:i.e., the Church, which is a feminine noun in Greek.

Babylon:The place of writing where the letter originated. Most agree it is a code name for the city of Rome, in central Italy.

See introduction:Origin.

my son Mark:John Mark, an early believer from Jerusalem (Acts 12:12) whom Christian tradition identifies as the author of the Gospel of Mark. Here associated with Peter, he was also a onetime companion of Paul (Col 4:10; 2 Tim 4:11).