Ramayana
एवं राम समुद्भूतो रावणो लोककण्टकः । सपुत्रो येन सङ्ग्रामे जितः शक्रः सुरेश्वरः ॥ 7-30-55 ॥
"Thus, O Rama, arose Ravana, that thorn in the side of the world, by whom, together with his son, Shakra the lord of the gods was vanquished in battle."
english translation