Lord Brahma wanted that lord may appear in his abode Brahmaloka or Satyaloka. Lord agreed to his prayers and resided as a deity in Satyaloka and worship began.
So lord came to Bramhaloka from Kshirsagar in the form of Sri Ranganath. Lord Brahma worshipped Him. Also Suryadeva – Vivaswan did the worship of Sri Ranganath in Satyaloka.
King Ikshvaku while ruling Ayodhya also wanted to worship Sri Ranganath in his kingdom of Ayodhya. He did austerities, so severe that Indra thought that he might take away my position and kingdom of heaven. Indra became worried and sent bramhastra. But Ikshvaku was meditating on Sri Ranganath, so Lord’s Sudarshan Chakra came and defeated the bramhastra. The lord became please with King Ikshvaku and agreed to descend to Ayodhya.
After Ikshvaku many great kings appeared in his dynasty. King Dashratha was one of them. He did many Yajna’s including putreshthi Yajna. At the conclusion of the Yajna king Dasharath gave darshan of Sri Ranganath to all the assembled dignitaries.
King Dharma Varma, who was also present at the yajna, saw the opulent worship of Sri Ranganath by Dasharath. He also became inspired to serve the Lord and thought, ‘could the lord also come to my kingdom and accept my worship’. So the lord noted this desire of the king. So Dharma Varma king‘s desire was noted by the Lord and the lord said so be it. The Lord made up His mind; I will come to your kingdom.
After Yajna, king Dasharath gave sweet rice to his wives and eventually four sons were born. When Rama grew and was about to be coroneted as the King of Ayodhya, by Kaikeyi’s request he was sent to 14 years of exile. After returning from exile, Rama reached Ayodhya. Before that He also went to Rameshvaram, Lanka, when he returned in Pushpaka Viman with Sita, Laxman, Hanuma, and Vibhishan. His coronation ceremony was performed.
Then Lord Rama asked Vibhishana to return to Lanka to rule over and take care for the kingdom as it was now his responsibility. But Vibhishan said, I do not want anything else, but you alone. Rama thought, I have to stay here in Ayodhya, I cannot go. But he wants me, so let me give him Ranganath. You take Sri Ranganath. There is no difference between me and Sri Ranganath. You may carry Him to Lanka.
The only thing you must bear in mind is that the annual festival for Sri Ranganath will occur at the time while you will be taking Him along. So you must stop on the way when the appropriate time for that festival arrives and organize it with great enthusiasm.Vibhishan agreed and left for Lanka. While he was passing by Sri Rangam, it was time for the festival.
King Dharma Varma was ruling Sri Rangam at that time and he came to know that Lord Ranganath has arrived. He was very happy to receive and to help in organising the festival. So there was a huge celebration for 7 to 9 days. After the festival was over, King Visbhishan thought I should proceed towards Lanka. When Vibhishan tried to lift the Lord, he did not even move an inch. After lots of endeavours, he realised that the lord wants to stay here.
King Dharma Varma became overjoyed at this. Sri Ranganath told Vibhishan, I will not come ahead of this place but from here I will keep looking South, towards Lanka. Usually the deity should face east; but here Sri Ranganath is lying with his face towards south. From here he kept giving blessings and mercy to Vibhishan.