On a trip to Rome, he ran into the sons of Cy Twombly and Paul Klee.

WSJ: All The Pretty Houses

The auction will also include pieces by Cy Twombly, Ellsworth Kelly, John Currin, Tauba Auerbach and Mark Bradford.

WSJ: Whitney Museum Building on Works of Its Artists

The only real evidence of the De Soles's worldly life is their art collection, which features works by Cy Twombly, Brice Marden and Mark Rothko, alongside modern Italian artists such as Giorgio Morandi, Piero Manzoni, Lucio Fontana and Alighiero Boetti.

WSJ: The House That Gucci Built