Daughter of Leopold I, Holy Roman Emperor, she married John V of Portugal. When he suffered a stroke, she ruled for him for eight years until his death and succession by their son, Joseph I. She was sister of Emperors Joseph I and Charles VI and of Maria Elisabeth of Austria, governor of the Netherlands.
Archduchess of Austria and sister of Maria Theresa of Austria, she and her husband were appointed governors of the Netherlands. She died with her first child in 1744. She was sister of Emperors Joseph I and Charles VI and of Maria Anna of Portugal, who ruled as regent of Portugal after her husband's stroke.
She was the daughter of Hapsburg Emperor Leopold I, and was appointed governor of the Netherlands. She never married. She's known for her cultural and artistic patronage.
She married first Afonso VI of Portugal, who has physical and mental disabilities. She and the king's younger brother led a revolt that forced Afonso to give up his power. She then married the brother, who succeeded as Peter II when Afonso died. Though Maria Francisca became queen a second time, she died that same year.
For forty years she ruled a substantial part of Europe, bearing 16 children, reforming and centralizing the government, and strengthening the army.
Marie de Medici, widow of Henry IV of France, was regent for her son, Louis XII
Mary II was the daughter of James II of England and Scotland, and his first wife, Anne Hyde. She and her husband, William of Orange, became co-rulers, displacing her father when it was feared he'd restore Roman Catholicism. She ruled in her husband's absences but deferred to him when he was present.
Second wife of James II of Great Britain, her Roman Catholicism was not acceptable to the Whigs, who saw that James II was deposed and replaced by Mary II, his daughter by his first wife.
Bon Mehr un-Nissa, she was given the title Nur Jahan when she married the Mughal Emperor Jahangir. His opium and alcohol habits meant that she was de facto ruler. He even rescued her husband from rebels who captured and held him.
Three sisters who ruled Thailand successively in the late 16th and early 17th century.