Why is it called a Bachelors degree?

Why is it called a Bachelors degree? Why do we even call men bachelor’s? This word has stumped the English language for too long. Here’s the mystery:

Originally, a bachelor was a solider that wasn’t old or rich enough to lead his army into battle under his banner. Because of this inferiority, these soldiers were called bachelors, meaning inferior rank.

As for the institutional degree? It was called a Bachelors degree to differentiate it from a doctorate degree. This could also imply that a Bachelors degree is inferior to doctorial studies, a higher ranking degree.

And, that’s the mystery to why we call it a Bachelor’s degree (and perhaps for single eligible men).