Lesage's 'Gil Blas' is a classic French novel written by Alain-Rene Lesage in 1715. It follows the adventures of Gil Blas, a young man from a poor family who rises to a high social position through his wit and cunning. The term 'Gil Blas' is derived from the Spanish phrase 'Giles de Blas', which means 'servant of God'. The crossword solution for Lesage's 'Gil Blas' is BLAS, a four-letter word.