Sumhuram.
A site on the coast near Mirbat Dhofar.
It has always been assumed that Sumhuram was founded in the 1st century CE, for the trade of frankincense between the Mediterranean Sea and India. The latest discoveries by archæologists from the Italian University of Pisa using pottery assemblage & C14 dating, put its foundation back to the 4th century BCE; it looks like it was an important stopping place on the trade route between south-eastern Arabia and the northern coast of Oman.
David A Lockwood 