Question: When was the supermarket founded by   Mary Ann Sainsbury's husband founded? 
Sentence (from "Sainsbury's"): Founded in 1869, by John James Sainsbury with a shop in Drury Lane, London, the company became the largest grocery retailer in 1922, was an early adopter of self-service retailing in the United Kingdom, and had its heyday during the 1980s.
Relevant evidence: Yes