Published online by Cambridge University Press: 21 April 2011
That the present San Marco (fig. 1) either incorporates substantial remains of earlier structures or has had its design constrained by structures no longer extant can hardly be doubted. This much is obvious even from the ground plan, especially at the ends of the north and south transepts. Further anomalies apparent in the building itself also suggest that it is not all of a piece. Setting aside obvious later changes that have not affected the basic form, they include the existence of pointed arcades alongside semicircular ones and the curious way in which the barrel vaults to the north and south of the eastern dome oversail the side chapels.