Input: Relationship: 'be bear', Argument/Subject 1: 'mark twain', Argument/Subject 2: 'samuel langhorne clemen'

Answer: Mark Twain was born in Florida under his real name , Samuel Langhorne Clemens , and moved to a port town on the Mississippi River as a young child , which would later inspire his two most famous books , The Adventures of Huckleberry Finn and The Adventures of Tom Sawyer .