Queendom is a realm ruled by a queen regnant. William and Mary became king and queen regnant. Bayinnaung installed Mahadewi as queen regnant of Lan Na. She continued to regard herself as queen regnant all her life. His paternal grandparents were Gaston IV of Foix-Grailly and Queen regnant Eleanor of Navarre. Accession of a queen regnant occurs as a nation's order of succession permits. Consorts of a queen regnant are not granted use of the British Royal Standard. The province was named after Isabella II, the first queen regnant of Spain. A woman could not serve as queen regnant, the monarch had to be male. In 1777, Maria became the first undisputed queen regnant of Portugal. She was crowned as queen regnant on 2 April at Bari. No queen regnant ever ruled France, for example. Through her brother Charles, she was an aunt of Maria Theresa, Austria's only queen regnant. However, the consorts of a Queen regnant are not entitled to use the Royal Arms. A ' () is a female ruler, or queen regnant.