The final group of paintings, drawings and sculptures bequeathed to museums by Paul Mellon before his death in 1999 have at last begun to arrive. Hidden away for decades, many are rarities that had never been seen by curators.

The group includes more than 200 works — examples by such artists as van Gogh, Degas, Gauguin, Monet and Seurat — that were only recently removed from the walls of the Mellons’ many homes, where they were enjoyed by his widow, Rachel Lambert Mellon, who died in March at 103.