when was rudolph the red-nosed reindeer song written

The song "Rudolph the Red-Nosed Reindeer" was first written by Johnny Marks in 1949. The song was based on a story written by Marks' brother-in-law, Robert L. May, in 1939. The story was originally intended to be used as a promotional piece for Montgomery Ward, a department store chain. However, it was later adapted into the song that we know today. The song has since become a holiday classic and has been covered by many artists over the years.