Princess Alexia of Greece and Denmark is daughter of King Constantine II and Queen Anne-Marie of Denmark, she was first in line for the throne until the birth of her brother, Crown Prince Paulos and then second-in-line until the birth of her second brother, Nicolaos two years later.
http://www.guide2womenleaders.com/Heirs.htm
After the death of her cousin, Lady Mary Grey, she was the first in line to succeed to the throne according to the The Third Succession Act of March 23, 1544. She was daughter of Lady Eleanor Brandon-sister of Frances Brandon.
http://www.guide2womenleaders.com/Heirs.htm
Her father was the second son of King Edward III of England and Philippa of Hainault, and therefore she was heiress presumptive to her cousin until her own death, she married Edmund Mortimer, 3rd Earl of March (circa 1351-81) in about 1368.
http://www.guide2womenleaders.com/Heirs.htm
Egypt seems to have done the same thing at the beginning of the New Kingdom. For the first time it established a full time army for service in peace time and in war and for the first time it sought to establish control over lands that contained people who were not Egyptian.
http://www.womenintheancientworld.com/royal_women.htm
The throne constructed in 1296, sometimes called the Coronation Chair or  King Edward's Chair , for 700 years used for the coronation of monarchs of England, of Great Britain, and of the United Kingdom. Succession to the British throne is determined by descent, legitimacy, and religion. Under common law, the crown is inherited by an individual's children and by a childless individual's nearest collateral line.
https://en.wikipedia.org/wiki/Succession_to_the_British_throne
ROYAL WOMEN IN ANCIENT EGYPT. Kingship was essentially a male activity in Ancient Egypt but Queens always had an important role to play. Royal women grew very powerful in the New Kingdom and clearly had an influence on the country.
http://www.womenintheancientworld.com/royal_women.htm
Egyptian kings had always had secondary wives, probably to increase the odds of having the all important son to inherit the throne, but the royal harem was small and discrete and kept very much in the background.
http://www.womenintheancientworld.com/royal_women.htm
Formerly, a new sovereign proclaimed his or her own succession. But on the death of Elizabeth I an Accession Council met to proclaim the succession of James I to the throne of England. James was then in Scotland and reigning as King James VI of Scotland. This precedent has been followed since.
https://en.wikipedia.org/wiki/Succession_to_the_British_throne
1306-16 Heiress Presupsumtive Marjorie Bruce of Scotland. Also known as Margaret de Bruce, she was the oldest daughter of King Robert I of Scotland and Isabella of Mar. Her paternal grandparents were Robert de Brus, 6th Lord of Annandale and Marjorie of Carrick, 3rd Countess of Carrick.
http://www.guide2womenleaders.com/Heirs.htm
If necessary, act as regent if her husband, the king, died before his son was old enough to rule on his own. Give silent support to her husband. Be a passive, but visible, complement to the king. ROYAL WOMEN IN THE NEW KINGDOM In the New Kingdom the Queen became much more prominent and powerful.
http://www.womenintheancientworld.com/royal_women.htm
who was given the power to determine the succession to the throne.
The succession to the throne was determine by the descent, legitimacy, and religion.