An exciting journey on the tracks of the first Christians on the Holy Land, accompanied by a great archaeologist. The vast territory of Roman Arabia extended from the Mediterranean to the Red Sea and included today's Jordan, the Sinai Peninsula, part of Syria and present-day Saudi Arabia. The province experienced an extraordinary development in the II and III centuries, crossed by the caravan traffic arteries and populated by cities such as Bostra, Gerasa, Petra, of which monumental remains stay on.The Byzantine emperors encouraged evangelization and Arabia knew a Christianity that left many architectural and artistic testimonies: this book collects and illustrates them, analyzing history, art and culture of the Christian populations of Arabia, which also lasted during the first two centuries of Islam. Piccirillo, a famous archaeologist, a man of culture and a Franciscan diplomat, was for years the man of dialogue in Palestine. His historical-archaeological work of reconstruction has shown how, for decades in these lands, Islam, Judaism and Christianity have coexisted: history and warning for our time.