Cosus, a male deity, was worshipped in the coastal areas where the Celtici dwelt, from the region around Aveiro, Porto and to Northern Galicia, but seldom inland, with the exception of the El Bierzo region in Leon, where this cult has been attributed to the known arrival of Galician miners, most notably from among the Celtici Supertamarici. This deity has not been recorded in the same areas as Bandua, Reue and Nabia deities occur, and El Bierzo follows the same pattern as in the coast. From a theonymical point of view, this suggest some ethno-cultural differences between the coast and inland areas. With the exception of the Grovii people, Pomponius Mela stated that all the "populi" were Celtic and Cosus was not worshipped there. Pliny also rejected that the Grovii were Celtic, he considered them to have a Greek origin.