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trasaddasyur itindro ’nga
vidadhe nama yasya vai
yasmat trasanti hy udvigna
yauvanasvo ’tha mandhata
cakravarty avanim prabhuh
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Mandhata, the son of Yuvanasva, was the cause of fear for Ravana and other thieves and rogues who caused anxiety. O King Pariksit, because they feared him, the son of Yuvanasva was known as Trasaddasyu. This name was given by King Indra. By the mercy of the Supreme Personality of Godhead, the son of Yuvanasva was so powerful that when he became emperor he ruled the entire world, consisting of seven islands, without any second ruler.