In all parts of the Graeco-Roman world, Isis became one of the most important figures of the "mystery religions", and many classical writers sometimes wrote about her temples, and followers. Temples to Isis were built in Iraq, Greece, Rome, even as far north as England where the remains of a temple were found at Hadrian's Wall. At Philae, she was worshiped until the 6th century, after the rise of Christianity. The fall of her temples is usually said to mark the end of ancient Egypt.