A window of yellow alabaster is illuminated at its centre with an image of the Dove of the Holy Spirit. This is above the Cathedra Petri or "Chair of St. Peter" altar at St. Peter's Basilica. The altar was created by Bernini. Bernini created a large bronze throne in which it was housed, raised high on four looping supports held effortlessly by massive bronze statues of four Doctors of the Church, Saints Ambrose and Augustine representing the Latin Church and Athanasius and John Chrysostom, the Greek Church. The four figures are dynamic with sweeping robes and expressions of adoration and ecstasy.