This is corroborated by the 1st century AD Greek document the Periplus of the Erythraean Sea, detailing multiple prosperous port cities in ancient Somalia, as well as the identification of ancient Sarapion with the city that would later be known as Mogadishu. When Ibn Battuta visited the Sultanate in the 14th century, he identified the Sultan as being of Barbara origin, an ancient term to describe the ancestors of the Somali people. According to Ross E. Dunn neither Mogadishu, or any other city on the coast could be considered alien enclaves of Arabs or Persians, but were in-fact African towns.