I was looking up this very question and I am afraid the person who responded may be mistaken. You are not asking about the English word "pace" but the Latin and/or Italian word "pace." I have often seen the latter used in academic English as a way of indicating that one politely disagrees with the person mentioned. So I think in those cases it means something like "even though Shakespeare said it" or "in spite of what Shakespeare thinks." For example, one might say "Pace Thomas Jefferson, all men are not created equal" or "Pace William Shakespeare, all the world's not a stage" or "Pace Henry Ford, history is not bunk' etc.