Very old 915AD keys

[rosie]

Hi, i have been gifted a pair of very old keys from my father. he was given them by his mother in the 50s and they were handed down ect. Dad believes these keys are from Saint Patricks ministry in Heysham and are from the year 915AD. i wonder how i can find out more about them, the history,the valuation if any and anything else interesting. i have googled and googled and haven't come across much help.