Ramayana
राक्षसानां निवासार्थं यथेन्द्रस्यामरावती । तत्र त्वं वस भद्रं ते लङ्कायां नात्र संशयः ॥ 7-3-27 ॥
It was made as a dwelling for the Rakshasas, even as Amaravati is the city of Indra. Dwell there, blessings upon you; in Lanka you shall live, of this there is no doubt.
english translation