I don't know if this will help any, but I found that Prince Charming was a fabric line from Tula Pink.
http://www.tulapink.com/prince-charm...49yokksrizyncv I don't see a pattern named Four Square but it just may no longer be available.
There is contact info on this page.
http://www.tulapink.com/free-pattern...dlqaceasp5j465
If they no longer have the pattern (if it is one of theirs) maybe they can give you access to a picture and we can help you figure out the pattern. Good luck!