"I will give you three pounds to let it go"
King Offa of Mercia silver penny
Public DomainKing Offa of Mercia silver penny - Credit: PHGCOM

The pound was a monetary unit from the 8th century onwards, after King Offa of Mercia introduced the silver penny.  It was the collective name for 240 silver pennies whose combined weight was one pound of silver. Pound notes, however, did not come into use in Britain until very much later, the first ones being produced in Scotland in 1696. Pound coins did not come into use until  1983.