Ramayana
राक्षसेन्द्रो ऽभिषिक्तस्तु भ्रातृभ्यां सहितस्तदा । ततः प्रदानं राक्षस्या भगिन्याः समचिन्तयत् ॥ 7-12-1 ॥
When the lord of the rakshasas had been consecrated, together with his two brothers, he then took thought for the giving away in marriage of his rakshasi sister.
english translation