I have a document that appears to be a Papal Bull and even has a lead seal of Pope Callistus III attached with twine. The document is written on vellum and is dated 1455. It is a 1 page document with a small bit of large calligraphy style writing on the reverse side and what appears to be an address of some sort. I am looking for advice on getting it translated. I have a few high quality scans in jpeg format that I can send. Any advice would be appreciated.