This is a carving in the stone near to the new entrance of Norwich Castle Museum’s redesigned keep. The museum notes that it dates to the thirteenth century and has been retouched many times, so although they don’t know who it was, they suspect it was a revered local religious figure. I assume that there’s a possibility that it’s the Virgin Mary, but it’s quite possible that no-one will ever know. It’s nicely preserved though and very visible to visitors to the museum.