Mark Twain's two famous historical novels are The Adventures of Tom Sawyer (1876) and Adventures of Huckleberry Finn (1885).
Other novels written by Mark Twain are:
1) The Prince and The Pauper
2) Life on the Mississippi
3) A Connecticut Yankee in King Arthur's Court
4) The Tragedy of Pudd'nhead Wilson
5) The Chronicle of Young Satan - unfinished work