Kannaki Amman is the deified form of Kannagi, the heroine of the Tamil epic Cilappatikāram. She is primarily worshipped in Sri Lanka and Kerala, and in a minor way in few parts of Tamil Nadu. As a goddess of chastity, she is venerated by Indian Tamils and Malayalis, Sri Lankan Tamil Shaivites, and also by the Sinhalese Buddhists as Pattini Amma. In regional Hindu tradition, her tale is interpreted as the story of Durga demanding justice after the death of her husband, Kovalan, who is identified as a form of Shiva.

Kannagi, sometimes spelled Kannaki, is a legendary Tamil woman who forms the central character of the Tamil epic Cilappatikaram. Kannagi is described as a chaste woman who stays with her husband despite his adultery, their attempt to rebuild their marriage after her unrepentant husband had lost everything, how he is framed then punished without the due checks and processes of justice. Kannagi proves and protests the injustice, then curses the king and city of Madurai leading to the death of the unjust Pandyan King of Madurai, who had wrongfully put her husband Kovalan to death. The society that had made her suffer, suffers in retribution as the city Madurai is burnt to the ground because of her curse. In Tamil folklore, Kannagi has been deified as the symbol – sometimes as goddess – of chastity, with sculptures or reliefs in Hindu temples iconographically reminding the visitor of her breaking her anklet or tearing her bleeding breast and throwing it at the city.