The Kalabhra dynasty, also called Kaḷabrar, Kaḷappirar, Kallupura or Kalvar, were rulers of all or parts of Tamil region sometime between the 3rd century and 6th century CE, after the ancient dynasties of the early Cholas, the early Pandyas and Chera. Information about the origin and reign of the Kalabhras is uncertain and scarce. It is believed by historians that the Kalabhras belonged to the Kalappalars of Vellalar community of warriors who were possibly once the feudatories of the Cholas and the Pallavas. Their proposed roots vary from southeast region of modern Karnataka, Kalappalars of Vellalar community, to Kalavar chieftains. This age is generally called "The Augustan age of Tamil Literature", in a 1922 book by the name "Studies in South Indian Jainism" written by M. S. Ramaswami Ayyangar and B. Seshagiri Rao. The Kalabhra era is sometimes referred to as the "dark period" of Tamil history, and information about it is generally inferred from any mentions in the literature and inscriptions that are dated many centuries after their era ended. According to Encyclopaedia Britannica, the Kalabhras were largely overthrown in the 5th century, as new power centers led by Chalukyas and Pallavas arose. In contrast, Upinder Singh states that Shivaskandavarman rise in the 4th century, as evidenced by inscriptions, show Kalabhras were not in power at that time near rivers Penner and Vellar (close to Kaveri). The Kalabhras dynasty had ended for certain by the last quarter of 6th century when Simhavishnu consolidated his rule up to the Kaveri river, south of which the Pandyas by then were already in power. Identification The origin and identity of the Kalabhras is uncertain. One theory states that they were probably hill tribes that rose out of obscurity to become a power in South India. Historical documents of the Vettuva Gounder community show that the Piramalai Kallars, who were a formerly a criminal tribe of Tamil Nadu were the Kalabhras. of the Other theories state that they were Karnatas probably from north of Tamil-speaking region (modern southeast Karnataka), or on etymological grounds may have been the Kalappalars of Vellala community or the Kalavar chieftains. According to Kulke and Rothermund, "nothing is known about the origins or tribal affiliations" of the Kalabhras, and their rule is called the "Kalabhra Interregnum". They are reviled in texts written centuries later, particularly by Tamil Hindu scholars. This has led to the inference that the Kalabhra rulers