Valmiki Ramayana Aranya Kanda Sarga 50 Shloka 4
Original Shlokaराजा सर्वस्य लोकस्य महेन्द्रवरुणोपमः। लोकानां च हिते युक्तो रामो दशरथात्मजः।।3.50.4।।
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दशरथात्मजः Dasaratha's son, रामः Rama, सर्वस्य of the entire, लोकस्य world, राजा king, महेन्द्रवरुणोपमः equal to Indra and Varuna, लोकानाम् in the world, हिते in the wellbeing, युक्तः engaged.
Rama, Dasaratha's son, is the king of the entire world. He is equal to Indra and Varuna. He is ever engaged in the welfare of the entire world.