From 300 BCE - 300 CE, the greatest accomplishments of the kingdoms of the early Chola, Chera and the Pandyan kingdoms included brick shrines to deities Kartikeya, 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. It is one of only two brick shrine pre Pallava Hindu temples to be found in the state, the other being the Veetrirundha Perumal Temple at Veppathur dedicated to Lord Vishnu. The dynasties of early medieval Tamilakkam expanded and erected structural additions to many of these brick shrines. Sculptures of erotic art, nature and deities from the Meenakshi Temple, and Ranganathaswamy Temple date from the Sangam period.