The painting turned out to be a watercolor by the English artist J.M.W. Turner. Born in 1775, Turner is “perhaps the best-loved English Romantic artist,” as London’s National Gallery writes.

In the late 18th and early 19th centuries, when J.M.W. Turner was a burgeoning artist ... went on to master the difficult traditional techniques of watercolor painting. He also singlehandedly ...

JMW Turner painted the watercolour of Chepstow Castle overlooking the River Wye in 1794 when he was 19 years old. Thought to have been created on the artist's first tour of south Wales ...

better known as JMW Turner and famous for a style which, as he aged and his technique refined, verged almost on the abstract. A great student of light and weather – he loved a good storm ...