This image is from the Hours of Étienne Chevalier by Jean Fouquet. It is one image from Fouquet’s paintings of the book of hours. It was commissioned by king Charles VII of France in the 14 Century.
In this image we see the Quaternity. The three white robbed men share a throne and to the left we see the Virgin on a thrown by herself. The three white-robed men may be seen as representing the Trinity, and the inclusion of the Virgin (divine mother) creates a Quaternity. Notice also that the painting forms a mandala.
A prayer of the same time period praised the Virgin as God’s equal
Ave, sedens solio, quod equale deo, per eterna secula nos commenda eo.
Hail, you who sit on the throne that is equal to God’s: commend us to him throughout the ages.
God and the Goddesses: Vision, Poetry, and Belief in the Middle Ages by Barbara Newman- 2003