In the 19th c. slavery practiced by the Ottomans put quite a number of white eastern Europeans on the block. Baker, the explorer who found the (one?) source of the Nile, was accompanied on his explorations by his wife, whom he had bought while on a grand tour in eastern Europe. Much later, they may have been married, but details are hard to find. The author of the book detailing their life together found representatives of Baker's family in England uncooperative.
See Richard Seymour Hall, 1980, "Lovers on the Nile, The Incredible Journeys of Sam and Florence Baker."