More than 600 years before the Inka empire ruled the Andean region of South American, during the period known as the Middle Horizon, there were two complex societies: the Tiwanaku and the Wari. In this volume, Katharina J. Schreiber explores the problem of the Middle Horizon through archaeological research in two specific areas: the Carhuarazo Valley and the Jincamocco site. Foreword by Jeffrey R. Parsons.