"This immeasurable great ocean was excavated by Sagara (A King of the Ikshvaku dynasty). The great ocean needs to do the task of Rama who is of the same race." [6-19-31]
To Rama who was by nature righteous the advice (of Vibheeshana) was pleasing. To Sugriva the king of monkeys, to the brilliant Lakshmana..... - [6-19-34]