early sideboards are little more than tables, usually located against the wall, they soon expanded to provide storage for plate in the form of open shelving. By the 18th century, the sideboard had retreated to the kitchen where it became a more utilitarian item sometimes known as a Welsh dresser, containing not only open-shelving but also enclosed cupboards below – effectively becoming the ancestor of today’s kitchen cabinetry.
A credenza is now more commonly understood as a form of flat-topped, longish, table-height cupboard or cabinet, used as a bookcase or display cabinet. Possibly this is because of the similarity to various Renaissance credenzas that were made to rest flat on the ground rather than being elevated on stands or legs (as were the early credenzas — which were pieces including court cupboards, sideboards, and hunt boards.
