queen consort
wife of a reigning king
Queen Consort of France
Title held by the Consort of the King of France
Great Royal Wife
principal wife of the pharaoh of Ancient Egypt
queen dowager
title or status generally held by the widow of a king
Queen Consort of Spain
Title held by the wife of the King of Spain
Queen Consort of the Belgians
Title held by the spouse of the reigning King of the Belgians