A collection of artworks, which is thought to be worth up to £100m, has been donated to the Tate and the National Gallery.
British art collector Simon Sainsbury, who died last year, bequeathed 18 paintings from artists including Claude Monet, Paul Gauguin and Lucian Freud.
Simon Sainsbury (1930-2006) was the great-grandson of John James Sainsbury and his wife Mary Ann Staples, the original founders of Sainsbury's.
The Tate will exhibit the 18 donated paintings in a show next summer before five are handed over to the National Gallery.
The Tate has not had a bequest on a similar scale since the 1930s and the National Gallery since the 1950s.
Tate director Nicholas Serota called it "one of the most important bequests" to the nation in the last 100 years.
Claude-Oscar Monet's Water-Lilies, Setting Sun, depicts a corner of the French Impressionist artist's water garden at Giverny.
Mr Sainsbury left an estate worth £300 million when he died in September, at the age of 76, after fighting Parkinson's disease.