Robin Williams possessions being auctioned in New York to raise funds for charity

Among the items is a robe worn by Daniel Radcliffe

Four years after his death in California’s Paradise City, personal belongings, movie memorabilia and art work belong to Robin Williams are to be auctioned in New York.

Sotheby's confirmed that hundreds of items, including paintings by Banksy and up to 40 watches from the Oscar-winning actor’s personal collection will come under the hammer. They will be sold along items belonging to his second wife, the movie producer Marsha Garces Williams, with much of the proceeds going to charities the couple supported.

Among the many items that will intrigue and delight film fans, is a so-called Gryffindor robe worn by Daniel Radcliffe in Harry Potter and the Sorcerer's Stone, which is estimated to be worth $10,000-$15,000.

The Hollywood Walk of Fame star presented to Williams in 1990 is expected to sell for between $3,000-$5,000.

Also being sold are a copy of An Actor Prepares by Konstantin Stanislavski and a prop sword from Hook and used by Williams as Peter Pan.

(Arthur Grace/ Sotheby's ) (Arthur Grace/ Sotheby's)

“Sotheby’s is honoured to announce that we will offer works from the collection of beloved entertainer Robin Williams and his wife of over 20 years, film producer and philanthropist Marsha Garces Williams, in a dedicated auction in New York on 4 October 2018,” the auction house said.

“Creating a Stage: The Collection of Marsha and Robin Williams" will offer works spanning Marsha’s and Robin’s diverse interests and careers, all reflecting their shared passion for collecting.”

It added: “The autumn auction will showcase: film and entertainment memorabilia, including autographed scripts, awards, props and wardrobe associated with projects across Marsha’s and Robin’s careers.”

Sotheby’s said a portion of the proceeds from the auction will benefit a number of organisations that championed by both Williams and his widow, including The Juilliard School, Wounded Warrior Project, the Challenged Athletes Foundation, and the Christopher & Dana Reeve Foundation.

The star of movies such as Good Will Hunting and Good Morning, Vietnam, Dead Poets Society, took his own life in August 2014. At the time there was speculation he had been suffering from depression.

But his wife of 20 years said she believed his death may have been prompted by a rare form of dementia - Dementia with Lewy bodies - that my have caused him to suffer from a lack of reason.