sentences:  The Saint Catherine's Monastery on Mount Sinai in Egypt was inhabited by hermits from the early days of monasticism.But the monastery as it is now was built by order of Emperor Justinian I between 527 and 565, enclosing the Chapel of the Burning Bush which had been built by St. Helena, the mother of St. Constantine the Great, at the site where Moses is supposed to have seen the burning bush.The site has been inhabited by monks ever since and is sacred to three major world religions – Judaism, Christianity, and Islam.