Grand Duke in the context of "Federal prince"

A boyar or bolyar was a member of the highest rank of the feudal nobility in many Eastern European states, including Bulgaria, Kievan Rus' (and later Russia), Moldavia and Wallachia (and later Romania), Lithuania and among Baltic Germans. Comparable to Dukes/Grand Dukes, Boyars were second only to the ruling princes, grand princes or tsars from the 10th to the 17th centuries.

The Vojinović family (Serbian Cyrillic: Војиновић, pl. Vojinovići / Војиновићи) is a medieval Serbian noble family that played an important role in the Serbian Empire during the 14th century. Following the death of Emperor Dušan (King 1331–1346, emperor 1346–1355), in the period of the Fall of the Serbian Empire, its representatives, Grand Duke Vojislav Vojinović (c. 1355–1363) and later his cousin Nikola Altomanović Vojinović (1366–1373), were among the strongest regional lords in medieval Serbia.

The Electorate of Baden (German: Kurfürstentum Baden) was a State of the Holy Roman Empire from 1803 to 1806. In 1803, the Imperial diet bestowed the office of Prince-elector to Charles Frederick, but in 1806, Francis II dissolved the Empire. Baden then achieved sovereignty, and Charles Frederick became Grand Duke.

Saxe-Weimar-Eisenach (German: Sachsen-Weimar-Eisenach) was a German state, created as a duchy in 1809 by the merger of the Ernestine duchies of Saxe-Weimar and Saxe-Eisenach, which had been in personal union since 1741. It was raised to a grand duchy in 1815 by resolution of the Congress of Vienna. In 1903, it officially changed its name to the Grand Duchy of Saxony (German: Großherzogtum Sachsen), but this name was rarely used. The grand duchy came to an end in the German Revolution of 1918–19 with the other monarchies of the German Empire. It was succeeded by the Free State of Saxe-Weimar-Eisenach, which was merged into the new State of Thuringia two years later.

The full grand ducal style was Grand Duke of Saxe-Weimar-Eisenach, Landgrave in Thuringia, Margrave of Meissen, Princely Count of Henneberg, Lord of Blankenhayn, Neustadt and Tautenburg.

Karl Theodor Anton Maria von Dalberg (8 February 1744 – 10 February 1817) was a Catholic German bishop and statesman. In various capacities, he served as Archbishop of Mainz, Prince of Regensburg, Arch-Chancellor of the Holy Roman Empire, Bishop of Constance and Worms, Prince-Primate of the Confederation of the Rhine and Grand Duke of Frankfurt. Dalberg was the last Archbishop-Elector of Mainz.

The House of Luxembourg-Nassau is the current royal house of Luxembourg. It was founded in 1921. It descends from the House of Nassau-Weilburg and from the House of Bourbon-Parma (agnatically), and consists of the extended family of the reigning Grand Duke. There have been three monarchs from the House of Luxembourg-Nassau: Jean, Henri, and Guillaume V.