He had a large collection of antique sculpture, the Arundel Marbles mostly Roman, but including some he had excavated in the Greek world, which was then the most important in England. His acquisitions, which also included fragments, pictures, gems, coins, books and manuscripts, were deposited at Arundel House, and suffered considerable damage during the Civil War; due to the war and subsequent neglect nearly half of the marbles were destroyed. After his death the remaining treasures were dispersed. The marble and statue collection was later bequeathed to Oxford University. It is now in the Ashmolean Museum.