The Kalachuris of Kalyani overthrew the Kalyani Chalukyas in the early part of the "12th century", and had a relatively short but stormy rule. The name "Kalachuri" is shared by multiple earlier dynasties, two of which ruled in central India. Some historians such as Dr. P.B. Desai believe that the southern Kalachuris of Kalyani are descendants of these central Indian dynasties. In the 6th century, before the rise of the Badami Chalukyas, the Kalachuris of Mahishmati had carved out an extensive empire covering areas of Gujarat, Malwa, Konkan and parts of Maharashtra. However, after their crippling defeat at the hands of Chalukya Mangalesha, they remained in obscurity for a prolonged period of time. Subsequently, the Kalachuris of Tripuri and their branches rose to power in central India.