Consorts of a queen regnant are not granted use of the British Royal Standard. Queendom is a realm ruled by a queen regnant. William and Mary became king and queen regnant. In 1724 Catherine was officially crowned and named co-ruler and as Empress regnant. In 1777, Maria became the first undisputed queen regnant of Portugal. However, the consorts of a Queen regnant are not entitled to use the Royal Arms. Upon her husband's death, their eldest daughter became the first queen regnant as Maria I. She then ruled as China's only empress regnant. Wu was the only empress regnant (or female emperor) in the history of China. As the Queen regnant of the Moon, she reigned during the first Silver Millennium era. Melisende created a precedent as the first designated heir and regnant queen. Accession of a queen regnant occurs as a nation's order of succession permits. No queen regnant ever ruled France, for example. She continued to regard herself as queen regnant all her life. The province was named after Isabella II, the first queen regnant of Spain.