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.

Robin Williams' widow pens poignant essay detailing comedian's final months

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&#039;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.”

In pictures: Robin Williams 1951 - 2014 Show all 25 1 /25 In pictures: Robin Williams 1951 - 2014 In pictures: Robin Williams 1951 - 2014 Mrs Doubtfire Robin Williams with Sally Field in Mrs Doubtfire In pictures: Robin Williams 1951 - 2014 Oscar He won the Best Supporting Actor Oscar for 'Good Will Hunting' in 1997 Getty In pictures: Robin Williams 1951 - 2014 Mork and Mindy In Mork and Mindy, the TV series that launched his career in the 1970s Rex In pictures: Robin Williams 1951 - 2014 The Tonight Show On 'The Tonight Show with Jay Leno' in 2004. Williams was renowned for his hyperactive appearances on talk shows Getty In pictures: Robin Williams 1951 - 2014 Williams' hand and footprint ceremony Williams with two of his children, Cody (centre) and Zelda, and his wife, Marsha, during his hand and footprint ceremony outside the Mann's Chinese Theatre in Hollywood in 1998 In pictures: Robin Williams 1951 - 2014 Premiere of Old Dogs Robin Williams and his wife Susan Schneider at the premiere of "Old Dogs" in Los Angeles on 9 November 2009 In pictures: Robin Williams 1951 - 2014 Tour de France US cyclist Lance Armstrong chatting with US actor Robin Williams after he won the 91st Tour de France cycling race between Valreas and Villard-de-Lans on 20 July 2004 In pictures: Robin Williams 1951 - 2014 Annual People's Choice Awards Presenter Robin Williams speaks during the 35th Annual People's Choice Awards held at the Shrine Auditorium on 7 January 2009 in Los Angeles, California Getty In pictures: Robin Williams 1951 - 2014 The Big Wedding All star cast: Susan Sarandon, Robert De Niro and Robin Williams star in The Big Wedding In pictures: Robin Williams 1951 - 2014 Building homes Robin Williams Helps Build Homes With Habitat For Humanity, 4 December 2000 in Wilmington Getty In pictures: Robin Williams 1951 - 2014 Premiere of Man of the Year Robin Williams and wife Marsha Garces Williams arriving for the premiere of Universal Pictures "Man of the Year" at Grauman's Chinese Theatre in the Hollywood section of Los Angeles on 4 October 2006 In pictures: Robin Williams 1951 - 2014 CW, CBS And Showtime 2013 Summer TCA Party Robin Williams at the CW, CBS And Showtime 2013 Summer TCA Party on 29 July 2013 in Los Angeles, California Jason Kempin/Getty Images In pictures: Robin Williams 1951 - 2014 Holiday Troop Visit Robin Williams and US celebrity Lewis Black (L) laughing in the back stage during the entertaining performance of "Holiday Troop Visit" by US celebrities for Christmas at boardwalk stage of the Kandahar Air Field, Afghanistan on 16 December 2010 In pictures: Robin Williams 1951 - 2014 Andre Agassi's Grand Slam for Children press conference Robin Williams speaks during the Andre Agassi's Grand Slam for Children press conference at the MGM Grand Hotel, 2 October 2004 in Las Vegas, Neveda Getty In pictures: Robin Williams 1951 - 2014 Golden Globe Robin Williams holds his Golden Globe after winning for best actor in a comedy for his role in 'Mrs. Doubtfire' 22 January 1994 Getty In pictures: Robin Williams 1951 - 2014 Premiere of Happy Feet Two Robin Williams attends the Premiere of Warner Brothers Pictures' "Happy Feet Two" at Grauman's Chinese Theatre on 13 November 2011 in Hollywood In pictures: Robin Williams 1951 - 2014 Good Will Hunting Matt Damon and Ben Affleck pose with actor Robin Williams with their Oscars they won for 'Good Will Hunting' at the 70th Annual Academy Awards 23 March in Los Angeles Getty In pictures: Robin Williams 1951 - 2014 Mork and Mindy Robin Williams in 1980 with Pam Dawber, his co-star in the Mork and Mindy TV series Rex In pictures: Robin Williams 1951 - 2014 The Crazy Ones Robin Williams with his Mork and Mindy co-star Pam Dawber in The Crazy Ones series, 2014 In pictures: Robin Williams 1951 - 2014 Yankees versus Pittsburgh Pirates Robin Williams attends a game between the New York Yankees and the Pittsburgh Pirates during the Grapefruit League Spring Training game on 13 March 2008 at Legends Field in Tampa, Florida Getty In pictures: Robin Williams 1951 - 2014 Posing Robin Williams poses for a portrait during the 35th Annual People's Choice Awards held at the Shrine Auditorium on 7 January 2009 in Los Angeles, California Michael Caulfield/Getty Images for PCA In pictures: Robin Williams 1951 - 2014 Cecil B. DeMille Award Robin Williams holds his Cecil B. DeMille Award with award presenter Pierce Brosnan at the 62nd annual Golden Globe Awards show 16 January 2005 in Beverly Hills Getty In pictures: Robin Williams 1951 - 2014 Happy Feet Two Robin Williams laughs with Elijah Wood on arrival for the world premiere of the movie 'Happy Feet Two' in Hollywood on 13 November 2011 Getty In pictures: Robin Williams 1951 - 2014 Tony Awards Robin Williams speaks during the 65th Annual Tony Awards at the Beacon Theatre on 12 June 2011 in New York City Getty In pictures: Robin Williams 1951 - 2014 AFI Life Achievement Award honoring Mike Nichols Actor Robin Williams speaks on stage during the 38th AFI Life Achievement Award honoring Mike Nichols held at Sony Pictures Studios on 10 June 2010 in Culver City, California Kevin Winter/Getty Images for AFI

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.