Robert Fielding was an English bigamist and rake in the late 17th and early 18th centuries. He was known as a handsome womanizer at the royal court of King Charles II, where he was given the nicknames "Beau" and "Handsome" Fielding, and later became the bigamous husband of the King's former mistress, Barbara Villiers, the first Duchess of Cleveland.
Beau Fielding
Beau Fielding, proposing to Mary Wadsworth
In a historical context, a rake was a man who was habituated to immoral conduct, particularly womanizing. Often, a rake was also prodigal, wasting his fortune on gambling, wine, women, and song, and incurring lavish debts in the process. Cad is a closely related term. Comparable terms are "libertine" and "debauché".
The Tavern Scene from A Rake's Progress by William Hogarth
John Wilmot, the most infamous of the Restoration rakes