Multiple choice general knowledge Samuel Baker , London bookseller , was the founder of which auction house? Siotheby's Samuel's Brokaway Sam Auction Reveal answer Fill a bubble to check yourself A Correct answer Explanation Samuel Baker, a London bookseller, founded Sotheby's auction house in 1744. Though the option spells it 'Siotheby's', this is clearly a typographical error for Sotheby's, which is now one of the world's largest auctioneers of fine art and valuables.