Brasses were a medieval form of memorialisation, originally limited to members of the cathedral clergy or to the wealthy and powerful. After the English Reformaton many of the brasses were ripped from the floor and sold off to metal markets, leaving only their casements remaining. In the 19th century most of the surviving casements at Rochester Cathedral were gathered and relaid in the North Quire Aisle.

Bibliography: rochestercathedralresearchguild.org/bibl...