Valmiki Ramayana Bala Kanda Sarga 71 Shloka 13

धर्मज्ञस्य knower of morality and ethics, तस्य of that, महात्मन: magnanimous, पुत्रद्वयम् two sons, जज्ञे were born, अहम् I am, ज्येष्ट: eldest, वीर: valiant, कुशध्वज: Kusadhwaja, मम my, अनुज: younger, भ्राता brother.

Hrasvaroma, was a religious king. He was a great soul. Of his two sons. I am the eldest and valiant Kusadhwaja is my younger brother.