Is the phrase "history is written by the victor" legitimate? If not, why?

by Booty_Sorcerer

Im taking a class right now where the professor uses this phrase a lot. It's a black studies course and I'm white so disagreeing is a non-starter, but especially in the American education system, does this phrase have weight?

Georgy_K_Zhukov

There is more to be said here, but this answer by /u/tenminutehistory is worth reading.