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.

Cilappatikāram, also referred to as Silappathikaram or Silappatikaram, is the earliest Tamil epic. It is a poem of 5,730 lines in almost entirely akaval (aciriyam) meter. The epic is a tragic love story of an ordinary couple, Kannaki and her husband Kovalan. The Cilappatikaram has more ancient roots in the Tamil bardic tradition, as Kannaki and other characters of the story are mentioned or alluded to in the Sangam literature such as in the Naṟṟiṇai and later texts such as the Kovalam Katai. It is attributed to a prince-turned-monk Iḷaṅkō Aṭikaḷ, and was probably composed in the 5th or 6th century CE.