A portrait of Sir Winston Churchill could fetch up to £800,000 when it goes up for sale at auction.

The painting, which shows Sir Winston side on against a dark background, will be exhibited at Blenheim Palace in Woodstock before it goes under the hammer.

It will go on view to the public from April 16 to 21 in the room where Sir Winston was born 150 years ago.

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The painting will have a guide price of £500,000 to £800,000 when it goes to auction on June 6.

It was created by artist Graham Sutherland and was commissioned by the Houses of Parliament for Churchill's 80th birthday in 1954.

Oxford Mail: The painting of Sir Winston Churchill The painting of Sir Winston Churchill (Image: Sotheby's London)

Sotheby’s in New York will hold the artwork from May 3-16 before transferring it to London between May 25 to June 5.

Andre Zlattinger, Sotheby’s head of modern British and Irish art, said: "The name Churchill evokes for each person a different snapshot of a multifaceted man.

“This version shows Churchill closer to how he wished to be perceived, his less austere and gentler side, and so it is tempting to imagine how his reaction might have differed.

“Having remained within the close circles of the artist and the sitter for generations, the sale of this work is an opportunity to acquire a piece of history.”

Prominent artists such as Sir William Orpen, John Singer Sargent, Walter Sickert, and Sir Oswald Birley painted Sir Winston over the course of his life.