then Pandya prince in south. The Pandya who was under the protection of the Vijayanagara appealed to the emperor and the Raya accordingly directed his agent (Karyakartta) Nagama Nayaka who was stationed in the south to put down the Chola. Nagama Nayaka then defeated the Chola but to everyone's surprise the once loyal officer of Krishnadeva Raya defied the emperor for some reason and decided to keep Madurai for himself. Krishnadeva Raya is then said to have dispatched Nagama's son, Viswanatha who defeated his father and restored Madurai to Vijayanagara. The fate of Virasekhara Chola, the last of the line of Cholas is not known. It is speculated that he either fell in battle or was put to death along with his heirs during his encounter with Vijayanagara. Administration and society Chola territory According to Tamil tradition, the Chola country comprised the region that includes the modern-day Tiruchirapalli District, Tiruvarur District, Nagapattinam District, Ariyalur District, Perambalur district, Pudukkottai district, Thanjavur District in Tamil Nadu and Karaikal District. The river Kaveri and its tributaries dominate this landscape of generally flat country that gradually slopes towards the sea, unbroken by major hills or valleys. The river, which is also known as the Ponni (Golden) river, had a special place in the culture of Cholas. The annual floods in the Kaveri marked an occasion for celebration, known as Adiperukku, in which the whole nation took part. Kaveripoompattinam on the coast near the Kaveri delta was a major port town. Ptolemy knew of this, which he called Khaberis, and the other port town of Nagappattinam as the most important centres of Cholas. These two towns became hubs of trade and commerce and attracted many religious faiths, including Buddhism. Roman ships found their way into these ports. Roman coins dating from the early centuries of the common era have been found near the Kaveri delta. The other major towns were Thanjavur, Uraiyur and Kudanthai, now known as Kumbakonam. After Rajendra Chola moved his capital to Gangaikonda Cholapuram, Thanjavur lost its importance. Government In the age of the Cholas, the whole of South India was for the first time brought under a single government. The Cholas' system of government was monarchical, as in the Sangam age. However, there was little in common between the local chiefdoms of the earlier period and the imperial-like states of Rajaraja Chola and his successors. Aside from the early capital at