Arnold Martinez, known professionally as Lil Duke, is an American rapper and singer from Atlanta, Georgia. Duke is a member of Young Thug's "Young Stoner Life Records". He started out as Yung Duke in the late 2000's before joining PeeWee Longway's music group label MPA BandCamp. In 2015 after MPA disbanded, after that he stuck with YSL as Lil Duke, which is the moniker under which he has released all of his music. However he is often credited on his features simply as Duke, his official stage name goes back and forth.