The silver crucifix was labelled as 'treasure' at an inquest recently, having been examined by the British Museum.
Keen metal detector Martin Rowson, from Preesall, came across the pendant by chance after asking a farmer in Forton if he could use his metal detector on his land.
"I had not really resear-ched any land, it was just a one-off chance," the 46-year-old said.
"The crucifix was completely submerged in pasture land, and at first I thought it was a bit of barbed wire.
"It was encrusted in soil and I didn't know what it was until I had cleaned it all off."
The crucifix was handed over to the British Museum for analysis. It is thought to date back to the 15th or 16th century.
"To find something like that, of that age and quality, is every metal detectors' dream," he said.
"I was over the moon, I just couldn't believe it.
"I didn't know it was made of silver at the time because hallmarking only started in the 1600s; I thought it was maybe pewter."
The BT cabling engineer has been interested in local history since a young age, and got his first metal detector at the age of 16.
Mr Rowson, who is a member of the Lune Valley Metal Detecting Club, is now awaiting the return of the pendant by the museum to proudly display in his home.