The character originated in stories told by Carroll to entertain the Liddell sisters while rowing on the Isis with his friend Robinson Duckworth, and on subsequent rowing trips. Although she shares her given name with Alice Liddell, scholars disagree about the extent to which she was based upon Liddell. Characterized by Carroll as "loving and gentle", "courteous to all", "trustful", and "wildly curious", Alice has been variously seen as clever, well-mannered, and sceptical of authority, although some commentators find more negative aspects of her personality. Her appearance changed from "Alice's Adventures Under Ground", the first draft of "Alice's Adventures in Wonderland", to political cartoonist John Tenniel's illustrations of her in the two "Alice" books.