 A tour of Chamonix in the French Alps inspired "Mont Blanc", a poem in which Shelley claims to have pondered questions of historical inevitability (determinism) and the relationship between the human mind and external nature.Shelley also encouraged Byron to begin an epic poem on a contemporary subject, advice that resulted in Byron's composition of "Don Juan".In 1817 Claire gave birth to a daughter by Byron, Alba, later renamed Allegra, whom Shelley offered to support, making provisions for her and for Claire in his will.