via Getty Images
The National Gallery will show rare portraits by Spanish artist Bartolome Esteban Murillo.

The exhibition, which opens next week, displays two self-portrait of Murillo, one in his 30s, and one in his 50s.

Dr Veronique Gerald Powell, a specialist of Spanish Old Masters,  told City News that one of the Murillo portraits is “virtually unknown.”

It was discovered in Penrhym Castle in Wales by Spanish scholar Benito Navarrete, and dates back to 1670.

Murillo is recognised as one of the most celebrated painters of the Spanish Golden Age, and known for his religious paintings and depictions of street children.

The exhibition is free to attend and will be running until late May.