The idea that anyone started Rock and Roll is a mistake. There were lots of fathers (and even a few mothers ) of the post WW2 music that upset parents as their kids turned away from the Hit Parade and big band music and moved to what were sometimes called Jungle Rhythms (lots of racism then too).
Something was in the air, as it always is with all artistic change. By the time Chuck Berry hit the scene the new music was already born. And it was a larger, broader music than just Chuck Berry, so included plaintive love songs and echoes from the America song book.
The thread started in the 1940s but by 1952-3 it was pretty much fully formed.
Here are a group of songs (from what is sadly called Doo-Wop) that have been considered the first Rock and Roll Record.
Gee is from 1953. A good copy of a 45 would be worth money.
Oh - and then there is Faye Adams, Shake a Hand. I'll let you look that up. Look up Alan Freed too.