When the Inca Pachacutec began to annex the coast valleys, he met with slight opposition only from the people of Inca origin, who soon submitted to his rule. But the Chimus struggled hard to retain their independence. Those of the Huarcu (_Cañete_) valley made a desperate and prolonged resistance. When at length they submitted, the Inca built a fortress and palace on a rocky eminence overlooking the sea to overawe them. The ruins now called Hervai are particularly interesting, because they are the principal and most imposing example of Inca architecture in which the building material is adobes and not stone. The conquest of the valleys to the north of Lima and of the grand Chimu himself was a still more difficult undertaking, necessitating more than one hard-fought campaign. When it was completed, great numbers of the best fighting-men among the Chimus were deported to the interior as _mitimaes_. More than a century had elapsed since this conquest when the Spaniards arrived, so that there was but slight chance of the history of the Chimus being even partially preserved. Cieza de Leon and Balboa alone supply us with notices of any value.[1310] The southern valleys of the coast, Arequipa, Moquegua, and Tacna, were occupied by _mitimaes_ or colonists from the Collao. The Incas gave the general name of _yuncas_, or dwellers in the warm valleys, to all the people of the coast. Much mystery surrounds the history and origin of the _Chimu_ people. That they were wholly separate and unconnected with the other races of Peru seems almost certain. That they were far advanced in civilization is clear. Difficulties surround any further prosecution of researches concerning them. They have themselves disappeared from the face of the earth. Their language has gone with them. But there are the magnificent ruins of their palaces and temples. There are numerous tombs and cemeteries which have never been scientifically examined. There is a grammar and a small vocabulary of words calling for close comparative examination. There are crania awaiting similar comparative study. There is a possibility that further information may be gleaned from inedited Spanish manuscripts. The subject is a most interesting one, and it is by no means exhausted. [Illustration: TAPESTRY FROM THE GRAVES OF ANCON. [After a cut in Ruge’s _Geschichte des Zeitalters der Entdeckungen_, p. 429, following the colored plate in _The Necropolis of Ancon_. Wiener reproduces in black and white many of the Ancon specimens.—ED.]]