Peris are exquisite, winged spirits renowned for their beauty originating in Iranian mythology. Peris were later adopted by other cultures. They are described in one reference work as mischievous beings that have been denied entry to paradise until they have completed penance for atonement. Under Islamic influence, peris became benevolent spirits, in contrast to the mischievous jinn and evil divs (demons). Scholar Ulrich Marzolph indicates an Indo-Iranian origin for peris, which were later integrated into the Arab houri-tale tradition.