premise: Francis I of France died in September.
hypothesis: Francis II of Brittany ( in Breton Frañsez II , in French François II ) ( 23 June 1433 -- 9 September 1488 ) was Duke of Brittany from 1458 to his death . Francis I ( François Ier ) ( 12 September 1494 -- 31 March 1547 ) was the first King of France from the Angoulême branch of the House of Valois , reigning from 1515 until his death .