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The Imperial Gazetteer emphasizes the religious influence of the two great epics; in addition, the Imperial Gazetteer provides a summary discussion of the Ramayana's plot. Ralph Griffith's translation (1870-74) of the Valmiki Ramayana is now available online, but it doesn't include the final book that contains the story of the killing of Shambuka.

The killing of Shambuka appears in the Valmiki Ramayana, Book 7, the 'Uttarakanda' [Final Chapter], sargas 73-76. Three scene-setting sargas are paraphrased, and then the crucial one is presented in full:

(73) When Rama is reigning as a virtuous king, a humble aged Brahmin comes to him, weeping, with his dead son in his arms. He says that Rama must have committed some sin, or else his son would not have died. (74) The sage Narada explains to Rama that a Shudra is practicing penances, and this is the cause of the child's death. (75) Rama goes on a tour of inspection in his flying chariot, and finds an ascetic doing austerities, and asks who he is.

"(76) Hearing the [inquiring] words of Rama of imperishable exploits, that ascetic, his head still hanging downwards [as part of his austerities] answered:— 'O Rama, I was born of a Shudra alliance and I am performing this rigorous penance in order to acquire the status of a God in this body. I am not telling a lie, O Rama, I wish to attain the Celestial Region. Know that I am a Shudra and my name is Shambuka.' As he was yet speaking, Raghava [Rama], drawing his brilliant and stainless sword from its scabbard, cut off his head. The Shudra being slain, all the Gods and their leaders with Agni's followers, cried out, 'Well done! Well done!' overwhelming Rama with praise, and a rain of celestial flowers of divine fragrance fell on all sides, scattered by Vayu. In their supreme satisfaction, the Gods said to that hero, Rama:— 'Thou hast protected the interests of the Gods, O Highly Intelligent Prince, now ask a boon, O beloved Offspring of Raghu, Destroyer of Thy Foes. By thy grace, this Shudra will not be able to attain heaven!'" (583-84)

The Ramayana of Valmiki trans. Hari Prasad Shastri (London: Shanti Sadan, 1970): 3:579-85.