In the Pacific Rim live action movies (2013 - 2018) they feature human manned mecha "robots". Before this, there were many others live actions / animated series featuring this, Evangelion (1995) , Robotech (1985) , Macross (1982), Star Wars (1983 - 1980 , dont recall seeing any of them in the 1977 movie) , Gundam (1979) , etc.
But which was the first story to feature a human manned mecha "robot"?