An antique dealer who bought a stained glass window in a Scottish thrift shop for $25 says it belonged to King Robert I, popularly known as Robert the Bruce from the 1300s.

Richard Drummond spotted the colorful glass for sale in Moffat, Scotland, and was told it had been discovered in an old house in the area which had been abandoned for years.

Removing decades of grease revealed the stunning stained glass beneath. It depicts what could be a knight, with a Latin inscription around the edges which roughly translates into ‘Robert Bruce, King of the Scots.’

Richard began researching online for information and sought the help of local and international experts to determine the age of the relic. He now believes it dates back to the 14th century and may have been installed in a castle taken over by the famous king who fought to restore independence in Scotland, becoming a national hero.

Richard believes it’s a massive find for the country and hopes it will be installed in a museum, if proven historically significant.

“I cleaned it off with a brush, then I could see it said ‘Robert Rex Scotorum’,” said the 49-year-old. “That’s when I thought this was going to be interesting.”

“It could be priceless. If this is proven to be of that period, it’s a massive historical find for Scotland,” Richard told SWNS news agency.

He started having a closer look at the glass itself, seeing the engravings and the way it was painted, details that made the local museum curator believe it was “hundreds of years old”.

Richard believes the glass may have come from France via the Knights Templar, while one expert he consulted believes it once was installed in a window of a castle taken over by the conquering king.

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“Which castle that is, I have no idea,” said Richard, who was on a mission to get the artifact dated and find out exactly where it came from.

To that end, he and his son Alfie were invited to appear on an upcoming episode of the BBC’s Bidding Room. The show’s experts confirmed it could be up to 700 years old.

“Is this something that was made in Scotland and England for Robert the Bruce? Is this part of the treasure that left France in 1307? Was it made in memory of him?

“It’s medieval art; it’s medieval Scottish history, and in my eyes, it’s just stunning.

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“It’s so well preserved (and) it’s been looked after. It’s a piece of history that’s been forgotten about in Moffat.

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