In a single campaign over the summer and fall of 1390, Bayezid conquered the beyliks of Aydin, Saruhan and Menteshe. His major rival Sulayman, the emir of Karaman, responded by allying himself with the ruler of Sivas, Kadi Burhan al-Din and the remaining Turkish beyliks. Nevertheless, Bayezid pushed on and overwhelmed the remaining beyliks (Hamid, Teke, and Germiyan), as well as taking the cities of Akşehir and Niğde, as well as their capital Konya from the Karaman. At this point, Bayezid accepted peace proposals from Karaman (1391), concerned that further advances would antagonize his Turkoman followers and lead them to ally with Kadi Burhan al-Din. Once peace had been made with Karaman, Bayezid moved north against Kastamonu which had given refuge to many fleeing from his forces, and conquered both that city as well as Sinop. However, his subsequent campaign was stopped by Burhan al-Din at the Battle of Kırkdilim.