Pietro Lorenzetti, Madonna and Child with the Blessing Christ, and Saints Mary Magdalene and Catherine of Alexandria with Angels (entire triptych), probably 1340, NGA 206124

Public domain image of medieval and early renaissance painting, 14th century, 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.