Savatthi

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At the moment of being swallowed by the earth, Devadatta uttered a stanza
 in which he declared that he had no refuge other than the Buddha.
It is this last act of Devadatta's which the Buddha had in view when he agreed to
ordain Devadatta. (http://www.palikanon.com/english/pali_names/d/devadatta.htm)

About Devadatta
http://en.wikipedia.org/wiki/Devadatta
http://www.palikanon.com/english/pali_names/d/devadatta.htm