Grand duke

Royal title

Grand duke is a European hereditary title, used either by certain monarchs or by members of certain monarchs' families. In status, a grand duke traditionally ranks in order of precedence below an emperor, king, grand prince, archduke, or prince-archbishop, and above a sovereign prince or sovereign duke. The title is used in some current and former independent monarchies in Europe, particularly:in the present-day Grand Duchy of Luxembourg historically by the sovereigns of former independent countries, such as Tuscany in Baden, Hesse, Oldenburg, Mecklenburg-Schwerin, Mecklenburg-Strelitz and Saxe-Weimar-Eisenach – grand duchies from 1815 to 1918, and all now part of Germany formerly also in some countries in Northern Europe, such as the Grand Duchy of Finland or the Grand Duchy of Lithuania

This keyword could refer to multiple things. Here are some suggestions: