Madonna and child with St Peter and St Paul

On the right one may recognize Saint Peter, holding the keys to Heaven, and tonsured (he is considered as the first priest of Christianity). On the left there is St Paul, depicted as usual as bald and holding a part of the Holy Scriptures. Both saints are often represented together because of their shared-life episode of the martyr. They are also some of the most celebrated saints  of the religion – that may be why they are offered such a prestigious place, next to the Virgin and child, in this sculpture.