San Callisto is a Roman Catholic titular church in Rome, Italy, built over the site of Pope Callixtus I's martyrdom.

Willem Jacobus "Wim" Eijk is a Dutch prelate of the Catholic Church, a cardinal since 2012. He has been the Metropolitan Archbishop of Utrecht since 2007. He was Bishop of Groningen-Leeuwarden from 1999 to 2007. Before his clerical career he worked as a doctor; as a priest he made medical ethics the focus of his academic studies.