Final answer:
Kanchipuram, also known as 'Kanchi', is the oldest city in Thondai Nadu. Its rich history can be traced back to the 1st Century AD, and it was the capital of several significant historical empires.
Step-by-step explanation:
The oldest city in Thondai Nadu is Kanchipuram. This city, often referred to as 'Kanchi', is located in the Indian state of Tamil Nadu and is known for its rich history and cultural significance. It is believed to have been in existence since the 1st Century AD, making it one of the oldest continuously inhabited cities in the world. The city was the capital of the Medieval Cholas and later served as the home to the Pallavas, Cholas, and Vijayanagara empires. Kanchipuram is also known for its numerous ancient Hindu temples and its thriving silk industry.
Answer: Kanchipuram
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