A duchy's a territory, fief, or domain ruled by a duke or duchess. Some duchies were sovereign in areas that'd become unified realms only during the Modern era (such as Germany and Italy). In contrast, others were subordinate districts of those kingdoms that unified either partially or completely during the Medieval era (such as England, France, and Spain). For the history of duchies as an institution, see the entry on Duke. Examples Traditionally, a grand duchy, such as Luxembourg, was generall… (More on Duchies)