Mark Twain three of his siblings survived childhood: Orion (1825–1897), Henry (1838–1858), and Pamela (1827–1904). His sister Margaret (1830–1839) died when Twain was three, and his brother Benjamin (1832–1842) died three years later. His brother Pleasant Hannibal (1828) died at three weeks of age. When he was four, Twain's family moved to Hannibal, Missouri, a port town on the Mississippi River that inspired the fictional town of St. Petersburg in "The Adventures of Tom Sawyer" and the "Adventures of Huckleberry Finn". Slavery was legal in Missouri at the time, and it became a theme in these writings. His father was an attorney
Mark Twain in Nevada Mark Twain in Nevada The use of the pen name of Mark Twain first occurred in Samuel Clemens's writing while in the Nevada Territory which he had journeyed to with his brother. Clemens/Twain lived in Nevada from 1861 to 1864, and visited the area twice after leaving. Historians such as Peter Messent see Clemens's time in Nevada as "the third major formative period of Mark Twain's career" (after his time in Hannibal and upon the Mississippi) due to his encounters with "writers and humorists who would both shape and put the finishing touches on his literary art." The "Routledge Encyclopedia