The High Middle Ages, or Classic Feudalism Period in what constitutes the present-day Republic of Azerbaijan, lasted from around the 11th century to the 15th century AD. The High Middle Ages were preceded by the Early Middle Ages and were followed by the Late Middle Ages, which ended around the 15thcentury AD. Key historical trends of the High Middle Ages include the incorporation of the territories that constitute present-day Azerbaijan into the Seljuk Empire, the establishment of the Eldiguzids, the Mongol invasions and the rule of the Ilkhanate, the invasions of Timur and the establishment of the Turkoman Kara Koyunlu and Aq Qoyunlu tribal confederations.