Barna da Siena
The Mystical Marriage of Saint Catherine
Tempera on panel
Museum of Fine Arts, Boston
This was one of the early attempts at getting Catherine and Christ "married" without implying a physical intimacy. The method that proved most popular is seen in the little vignette between the two large figures: With mother Mary in attendance, the Christ Child hands St. Catherine the ring.
In the predella devils are attacked by St. Catherine on the left and an angel (Michael?) on the right. In the center, another angel presides over a reconciliation between two men.
Read more about images of St. Catherine of Alexandria.
Source: this page at Wikimedia Commons.