Portunus, an ancient Italic God, grants access to the gates (porta) and to the harbor (portus). He also protects the warehouses where grain is stored. This God is depicted holding keys. At his festival, the Portunalia (August 17), people offer their house keys in fires for blessings from Portunus for their homes. I pass my keys through a candle flame.
The Romans have many Gods, Who guard the entry into the home. Janus guards the door, Cardea the hinges, Forculus the doorway, and Limentinus the threshold. Portunus guards the outside gates. The liminal place between the Inside and the Outside is fraught with things unknown. Care must be made to ensure that only good things will come in and bad things leave.
Guardian of Gates
We offer You our keys
Bless them and our homes
Guardian of Harbors
Aid the harbormaster in their duties.
Guide the ships to port
We thank You.