Queens and Kings are born in palaces and castles, their arrivals proclaimed across the lands they will one day rule by heralds, the lighting of bonfires and the ringing of bells. That's what the storybooks tell us and in many cases it is true. But the baby girl who would go on to make history by becoming Britain's longest reigning monarch made her debut in rather more low key surroundings. Elizabeth II, Queen of England, was born at her grandad's London house.