Elizabeth X
I'm the bloody Queen, mate. Basically, I rule!
Elizabeth the Tenth, known as Liz 10 was the Queen of Britain when Earth was devastated by solar flares. She'd grown up on stories of the Doctor, as had her whole family.
She found a Space Whale and enslaved it to form the base of Starship UK. She then wiped her mind so that she would not have to deal with the consequences. Her government slowed down her body clock, keeping her effectively immortal. She thought she was 50 and had been on the throne for ten years, not knowing she always lived the same ten years, always found out the truth about Starship UK at the end of it, and always wiped her mind once more.
300 years later when The Doctor and Amy Pond came to Starship UK, they found out the truth and told Elizabeth, finding this out she then went on to make a better future for the Humans of Starship UK. (DW: The Beast Below)
