http://www.barganews.com/2015/09/23/selma-sevenhuijsen-matilde-di-canossa/
Selma Sevenhuijsen – Matilde di Canossa
Selma in her book on the subject has put forward the theory that there is a good possibility that the faces sculpted near to the pulpit in The Duomo are in fact the faces of Matilda, her mother Beatrice and her father Boniface.