Tamil Nadu is known for its ancient temple architecture. Nearly 33,000 ancient temples, many at least 800 to 2000 years old, are found scattered all over Tamil Nadu. As per Tamil Nadu Hindu Endowments Board, there are 38,615 temples. Most of the largest Hindu Temples reside here. Studded with complex architecture, a variety of sculptures, and rich inscriptions, the temples remain the very essence of the culture and heritage of Tamil land, with historical records dating back to at least 3,000 years.
The state also abounds with a large number of temple tanks. The state has 2,359 temple tanks located in 1,586 temples and also confluence of many architectural styles, from ancient temples to the Indo-Saracenic style (pioneered in Madras) of the colonial era, to churches and mosques, to the 20th-century steel and chrome of skyscrapers.
Throughout Tamil Nadu, a king was considered to be divine by nature and possessed religious significance. The king was 'the representative of God on earth’ and lived in a "koyil", which means the "residence of God". The Modern Tamil word for temple is kovil. Titular worship was also given to kings. Other words for king like "kō" ("king"), "iṟai" ("emperor") and "āṇḍavar" ("conqueror") now primarily refer to God. Tholkappiyar refers to the Three Crowned Kings as the "Three Glorified by Heaven". In the Dravidian-speaking South, the concept of divine kingship led to the assumption of major roles by state and temple.
From 580BCE - 300CE, the greatest accomplishments of the kingdoms of the early Chola, Chera and the Pandyan kingdoms included brick shrines to deities Murugan, Shiva, Amman and Vishnu. Several of these have been unearthed near Adichanallur, Kaveripoompuharpattinam and Mahabalipuram, and the construction plans of these sites of worship were shared to some detail in various poems of Sangam literature. One such temple, the Saluvannkuppan Murukan temple, unearthed in 2005, consists of three layers. The lowest layer, consisting of a brick shrine, is one of the oldest of its kind in South India, and is the oldest shrine found dedicated to Murukan.