Since Elizabeth wasn't going to have children without a husband
the Crown would go back up the line to Henry VIIIs brothers and
sisters. He had no brothers who survived long enough to have
children so it goes to the eldest sister, this being Margaret Tudor who had married James IV of Scotland and had a son, James V of
Scotland.
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This is the Big Question of the Tudor age.
Henry VIII and his six wives had only produced three surviving children. Mary Tudor, Elizabeth Tudor and Edward Tudor.
The only boy therefore became Edward VI but he died unmarried with no children so the Crown came back up to the two daughters of Henry. First the elder Mary Tudor as "Mary I (Bloody Mary)", who also died without children, then Elizabeth as "Elizabeth I (The Virgin Queen)".
Since Elizabeth wasn't going to have children without a husband the Crown would go back up the line to Henry VIIIs brothers and sisters. He had no brothers who survived long enough to have children so it goes to the eldest sister, this being Margaret Tudor - who had married James IV of Scotland and had a son, James V of Scotland.
But by the time Henry died so had James V (of an illness after a battle with the English no less...) so the search for an English heir goes down his line, his only surviving legitimate child was Mary Stuart, who is Mary, Queen of Scots.
This means she is the next in line to the English Throne - when Elizabeth dies, and if you take the view that Henry VIIIs later marriages were illegal then she actually should replace Elizabeth, which is the major political squabble of the age...
Very little. She spent nearly 20 years in captivity, mostly at Fotheringhay Castle in Northamptonshire.
She would have worn clothes that were of fashion in her time period, such as the ruff, and for her position in society. She was also well known for wearing heart-shaped affitets.