mnli premise: Agatha Mary Clarissa, Lady Mallowan, DBE (15 September 1890 - 12 January 1976), commonly known as Agatha Christie,was an English crime fiction writer. hypothesis: The English crime fiction author Agatha Mary Clarissa, Lady Mallowan, often known as simply Agatha Christie was born in September of 1890 and died in January of 1976.