If you are on about the 1982 Formula 1 Monaco GP then it was Riccardo Patrese. Didier Pironi came in second and Andrea de Cesaris came in 3rd.
The first Grand Prix of Monaco was in 1929, and was won by William Grover-Williams driving a Bugatti
British driver Graham Hill won the 1963 Monaco Grand Prix Formula One motor races.
Mark Webber won the 2010 Monaco Grand Prix.
Damon Hill never won the Monaco Grand Prix.
Louis Chiron Bugatti
Giuseppe Farina Maserati
Vittorio Marzotto Ferrari
Stirling Moss Maserati