

It was William Caxton about 600 years ago who owned it.
Everything I found just now talks about how great a historical figure he was, and implies he somehow was personally doing the work.
But if you dig deeper you should be able to find reference to the Dutch workers he brought with the press who knew how to use it and actually set the type on the presses. They were the ones actually making those books that standardized English grammar and spelling.
I don’t have the time at the moment, but if you’re interested then that’s enough to start researching
Right/left only exists to stop us from realizing it should be top/bottom