Lineal Champions whom were teenagers

I'm guessing this list will be a short one, but so far I can only think of 2 and they were Benitez and Pacquiao. Benitez at 140 when he became the man in the division at 17 and Pacquiao at 112 when he was 2 or 3 weeks shy of his 20th birthday. Being lineal champ and being considered the man in the division is impressive enough but to do it in your teenage years when you're fighting guys that have been pros longer and are more physically matured is really a rare feat. So basically if anyone can lists a few more I would appreciate it.

Pipino Cuevas was 18 when he won a welterweight belt.

Tony Canzoneri was 18 when he won the featherweight title in 1928.