He was an american author whose works included "for whom the bell tolls," "a farewell to arms," and "the sun also rises."

The correct answer is Ernest Hemingway. This American novelist and journalist won the Nobel Prize in Literature in 1954; he published “Farewell to arms” in 1929, “For whom the bells toll” in 1940, and “The sun also rises” in 1926, which was his debut novel. Most of his works are classics of the American Literature.

A constitutional monarchy is a form of monarchy in which the sovereign exercises authority in accordance with a written or unwritten constitution