site suggests that Alagankulam is one of the important trade centers or port cities of the Sangam Era. Ancient Tamil Nadu contained three monarchical states, headed by kings called Vendhar and several tribal chieftaincies, headed by the chiefs called by the general denomination Vel or Velir. Still lower at the local level there were clan chiefs called kizhar or mannar. The kings were known as the Moovendar, the three crowned kings, and were the Cheras, Cholas and Pandyas. The Cheras controlled the western part of Tamilkam, what is today western Tamil Nadu and Kerala. The Pandyas controlled the south, what is today southern Tamil Nadu. The Cholas had their base in the Kaveri delta and controlled what is today northern Tamil Nadu. Although these dynasties were never conquered by outside powers, there were still significant diplomatic contacts between them and kingdoms to the north. They were mentioned on the pillars of Ashoka. These rulers sponsored some of the earliest Tamil literature. The oldest Sangam work we have knowledge of is the Tolkappiyam, a book of Tamil grammar. Most Sangam literature dealt with themes of love and war. In these poems, a glimpse of Tamil society at the time can be glimpsed. The land was fertile, and people pursued different occupations depending on what regions they were in. Their gods included figures such as Seyyon and Kotravai, who were worshipped at different places. The rulers patronised Buddhism and Jainism, and starting in the CE period references to Vedic customs begin to grow. Significant trade was also undertaken with the outside world. Much commerce from the Romans and Han China converged in the Tamil region, and the seaports of Muziris and Korkai were very popular destinations. One of the most prized goods from Tamilkam was spices such as black pepper, but other spices, pearls and silk were also widely traded there. Starting in 300, however, there was a significant drop in Sangam literature. Some have attributed this to the Kalabhras, a dynasty which conquered much of Tamilkam during that time. Historians have speculated these rulers were antagonistic towards the astika schools which were dominant in later centuries, which is why later texts always portray their rule in a bad light, if at all. During their rule, Samanar traditions greatly impacted literature written during this time. Literacy was widespread and epics such as the Cilappatikaram were written. The most prominent of these works