Giovanni di Paolo
St. Margaret

After 1463
Metropolitan Museum of Art

The museum identifies this as St. Margaret, consistently with the dragon-like monster or demon at the bottom of the painting (see detail). But note the basket of roses: this could be St. Dorothy.

More of St. Margaret
More of St. Dorothy

Photographed at the Metropolitan by Richard Stracke, shared under Attribution-NonCommercial-ShareAlike license.