A very similar name was recently used by Lotrek for a deck he designed and released called Sanctus. You might want to consider a different title to avoid market confusion.
The back is nice, lots of detail, though consider removing the name from the design - it doesn't add anything.
The court cards have little to no connection to the theme. They look pretty much like any modern deck, with the characters looking barely different from your average pack of Bicycle Standards. Is there some way you could really rework and redesign them so they look more connected to the theme, be it through Gothic architecture or perhaps even Gothic dress? Don't just borrow someone else's faces, tweak them a little and call it a day - really go the extra mile and make something original.