Who built the first powered monoplane?

The first powered monoplane was built by the Wright brothers, Orville and Wilbur Wright. They designed and flew the Wright Flyer, which made its first powered flight on December 17, 1903. Although it had a biplane configuration, their later designs, including the Wright Flyer III, advanced the concept of powered monoplanes. The first true powered monoplane is often credited to Robert Esnault-Pelterie, who flew his aircraft in 1910.