Madonna and Child Enthroned with Saints Peter, Bartholomew, Catherine of Alexandria, and Paul, and (below) the Nativity; left wing (top to bottom): Annunciatory Angel, Crucified Christ with the Virgin, Saints Mary Magdalen and John, and Christ as the Man of Sorrows; right wing (top to bottom): Virgin Annunciate, Saints Onophrius and Paphnutius, and Saint Onophrius Buried by Saint Paphnutius.

Public domain photo of a golden object, Italy, free to use, no copyright restrictions image - Picryl description

St. Catherine of Alexandria was a 4th-century Christian martyr and saint. According to tradition, she was a learned and beautiful woman who converted to Christianity and became a noted defender of the faith. She was imprisoned and subjected to various tortures, including being broken on a wheel, but survived. She is said to have converted the emperor Maxentius to Christianity before her ultimate execution. St. Catherine is the patron saint of philosophers, students, and preachers and is venerated by the Roman Catholic, Orthodox, and Coptic Churches.