Queen consort of Hungary in the context of "Holy Roman Empress"

Elizabeth of Poland (Hungarian: Erzsébet, Polish: Elżbieta; 1305 – 29 December 1380) was Queen of Hungary by marriage to Charles I of Hungary, and regent of Poland from 1370 to 1376 during the reign of her son Louis I.

Helena of Serbia (Serbian: Јелена/Jelena, Hungarian: Ilona; b. after 1109 – after 1146) was Queen of Hungary and Croatia as the wife of King Béla II. After her husband's death, she governed Hungary as regent from 1141 to September 1146 together with her brother, Beloš, during the minority of her eldest son, Géza II, came of age.

A daughter of Prince Uroš I of Serbia (r. ca. 1112–1145), she was arranged to marry Béla II in 1129 by his cousin, King Stephen II (r. 1116–1131). Her younger sons, Ladislaus II and Stephen IV, also ruled as kings of Hungary. She had two other brothers Uroš II and Desa besides Beloš.

Margaret Theresa of Spain (Spanish: Margarita Teresa, German: Margarete Theresia; 12 July 1651 – 12 March 1673) was, by marriage to Leopold I, Holy Roman Empress, German Queen, Archduchess of Austria and Queen of Hungary and Bohemia. She was the daughter of King Philip IV of Spain and the elder full-sister of Charles II, the last of the Spanish Habsburgs. She is the central figure in the famous Las Meninas by Diego Velázquez, and the subject of many of his later paintings.