Overview
Arabella Churchill (23 February 1648 – 30 May 1730) was the mistress of King James II and VII, and the mother of four of his children (surnamed FitzJames, that is, "son of James").
Life
She was a daughter of Sir Winston Churchill and sister of John Churchill, 1st Duke of Marlborough; her other brothers were George Churchill, Admiral of the Blue and General Charles Churchill. The Churchills' loyalty to the royal household was ardent; their only feeling about Arabella's seduction by King James II "seems to have been a joyful surprise that so plain a girl had attained such high preferment".
James, then Duke of York, began his adulterous affair with Arabella Churchill, around 1665, while he was still married to Anne Hyde. Churchill became the duchess's lady-in-waiting in that year, and gave birth to two children during Anne's lifetime. Churchill was described as a "tall creature, pale-faced, and nothing but skin and bone".
Courtiers cackled "at her appearance until she fell off her horse in front of a crowd, displaying her magnificent legs". One awestruck witness marvelled that "limbs of such exquisite beauty could belong to Miss Churchill's face".
From Wikipedia (CC BY-SA 4.0).