The paintings feature landscapes around the castle
A previously unseen collection of artwork is to go on display at Penrhyn Castle near Bangor, Gwynedd.
The watercolours are the work of the Hon Alice Douglas Pennant, who was known locally as Lady Alice, the third of Lord Penrhyn's 15 children.
Lady Alice died 70 years ago, and until now the work has been kept in storage.
As well as her talent as an artist, Lady Alice was responsible for cataloguing Penrhyn Castle's art collection, a system still used today.
"We're absolutely delighted to be able to show these paintings to the public," said Clare Turgoose, the conservator at the castle.
"They hadn't even been framed until now and it will be a joy to see this entire collection of works by a truly remarkable woman," she added.
Lady Alice was said to be the favourite of her grandfather, the first Lord Penrhyn, who inspired her life-long interest in art.
Her knowledge of art came from her childhood surrounded by works by Rembrandt, Canaletto and Gainsborough.
Lady Alice was the third of Lord Penrhyn's 15 children
The paintings on display show scenes of the landscape around the castle.
Penrhyn Castle's learning and communications manager, Marian Gwyn, added: "We can see that she was a very skilled painter.
"The paintings reveal a variety of styles, from quite wild to fairly muted scenes."
Ms Gwyn said it was exciting the work had come out of storage.
"So often the men of the important families get all the attention but here there's a very visible sign of how the women of this remarkable family left their mark."
The pictures will be on show from 1-27 April and from 25 September to 1 November at the castle.