I stumbled upon this video earlier today. Here, starting at around 0:50, the Funky Academic claims that freedom used to be defined as having the ability to do your duty. Contrarily, again according to him, today it's defined as the ability to do whatever you want.
It's a tad unclears whether or not he's claiming that that's how the definition has evolved among liberals or in the whole of political philosophy. However, I am going to ask the more general question; I want to know how accurate his claim is, but it shouldn't be too broad to ask how the definition of freedom has evolved over the centuries.