Question: Lanark Grammar School celebrated its octocentenary in 1983, including a visit by Princess Royal born in which year ?
Sentence (from "Anne, Princess Royal"): Anne, Princess Royal, {'1': ", '2': ", '3': ", '4': "} (Anne Elizabeth Alice Louise; born 15 August 1950) is the second child and only daughter of Queen Elizabeth II and Prince Philip, Duke of Edinburgh.
Relevant evidence: Yes