The most detailed study of the area was made by the French priests Antonin Jaussen and Raphael Savignac, who visited the area three times, in 1907, 1908 and 1910. They studied the remains at Hegra and Dedan and collected a large number of Lihyanite, Minaean, Thamudic and Nabataean inscriptions. Accordingly, it was their work that came to constitute the basis for all further study and research in the history of the area.[8]