sentences:  In 1236, the Ilkhanate Mongol armies invaded the Caucasus.Prior to them entering Khachen, Hasan Jalal and his people were able to take refuge at Ishkhanberd (located directly south of Gandzasar; also known by its Persian name of Khokhanaberd).Given its formidable location atop a mountain, the Mongols chose not to besiege the fortress and sued for negotiations with Hasan-Jalal