Who was the first quarterback to throw for 50 touchdowns in a single season?

Question: Who was the first quarterback to throw for 50 touchdowns in a single season?

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More games: guess the idiom answers, infinite pics,  guess the emoji answers.

7 little words

1. Appreciating the flavor of
2. Home to the NFL's Steelers
3. Five-fingered appendage
4. Bull's weapons 7 Little Words
5. Control 7 Little Words
6. Actress Blake 7 Little Words
7. Wall-mounted light fixture
8. Appreciating the flavour of
9. City in Pennsylvania
10. Booker Prize winner Penelope