Portrait of Princess Elizabeth I found

LONDON, May 27 (UPI) -- A rare portrait depicting England's Elizabeth I as a young princess reportedly has been found in a stately home in Northamptonshire.

The painting, discovered in the Duke of Buccleuch's collection at Boughton House, is believed to be a mid-17th century copy of an original work that dates back to the early 1550s, the BBC reported.

In the portrait, Elizabeth is pictured with her siblings, Edward VI and Mary I, as well as her father Henry VIII and his jester, Will Somers.

The painting has been studied by historians and is to go on display when the stately home opens to the public in August.

The British network said only two other paintings of Elizabeth before her accession to throne are known to exist.

"The more we found out, the more obvious it was that nobody had come across this," historian Tracy Borman told the BBC. "It's clearly a copy of a lost original and it's that mystery that we started to try to solve. It's also a very different look to Elizabeth and comparing it to other portraits it helps us to solve the identity of other portraits -- for example, one always known as the 'Unknown Lady' in the National Portrait Gallery."