How was Guglielmo Marconi awarded the Nobel Prize?

Name: Guglielmo Marconi. 
Country: Kingdom of Italy.
Date of Birth: 25 April 1874.
Died: 20 July 1937.
The subject of Study: Hertzian wave.
Noble Prize Year: Nobel Prize for Physics in 1909 for their research on the contributions to the development of wireless telegraphy.