A Palfrey is a type of horse, not a breed of horse.
The significant characteristic is that a palfrey has a smooth gait instead of a trot. The smooth gait is achieved by walking with a 4 step rhythm: left hind, left front, right hind, right front. In this sequence there is a moment when the horse has only 1 foot on the ground - Sometimes this type of horse is referred to as a Single footer. Such a gait can be maintained for long distances and at considerable speed.
Palfreys are now rare in Europe. They were effecively replaced by trotting horses when travel by carriage became more common, several hundred years ago, and trotting horse breeds were generally larger and stronger.
Known as the "D.C. Madam," Deborah Jeane Palfrey is the former owner of Pamela Martin and Associates, a Washington D.C. based business that functioned as a high-end adult fantasy firm.
Palfrey's business offered legal sexual and erotic services across the spectrum of adult sexual behavior, and did so without incident.
Palfrey has offered up 42 pounds of customer phone records to the public in an effort to elicit testimony on her behalf.