"Nobody can do injustice to Ayodhya," Adityanath said, adding that the holy city was identified with Lord Ram.
He also announced the setting up of a new airport in Ayodhya, named after Lord Ram, and a medical college in the name of king Dashrath, father of Lord Ram, in the district.
"Deepotsav is about starting a new tradition," Adityanath said at the Ram Katha Park here on the eve of Diwali. The event was also attended by the First Lady of South Korea, Kim Jung-sook, and Uttar Pradesh Governor Ram Naik.
Several projects, including those related to the redevelopment and beautification of "Ram Ki Paidi" and the stoppage of sewage disposal in the Sarayu river, were launched at the event.
"We have come to work for Ayodhya and a South Korean delegation has also come here to connect with its past. Ayodhya's identity will remain with Ayodhya and this Korean delegation is a witness to that. I want to announce today that this district will now be known as Ayodhya as well," the chief minister said.
A section of the crowd was also heard chanting "Mandir ka nirman karao" (build a temple).
Ayodhya is known around the world for Lord Ram and the festival of Diwali is celebrated due to the legend of him returning home from "vanvas" (exile).
"We have kept our memories alive, so that no one can disturb our memories. We have our traditions which we want to take forward. Everybody is seing what Ayodhya wants and we have come here to see what Ayodhya wants," he added.
Later, on the banks of the Sarayu river, a new world record was also set with over three lakh "diya" (earthen lamps) lit up simultaneously, officials said.
"A total of 3,01,152 earthen lamps were lit up simultaneously for five minutes, which is a new record," Rishi Nath, official adjudicator of the Guinness World Records, said in the presence of Adityanath and Kim.
Kim visited the site, along with Adityanath , and attended the ground-breaking ceremony for the upgrade and beautification of the memorial dedicated to the legendary princess of Ayodhya who went to Korea.
From there, she went to the Deepotsav festivities, where she was greeted by artists donning the avatar of Lord Ram and Goddess Sita, who arrived at the Ram Katha Park in a ceremonial chopper as part of the "Ram Durbar".
Kim garlanded "Sita" as they got off the helicopter and Naik and Adityanath welcomed "Lord Ram" and "Laxman".
Union minister V K Singh also attended the grand event.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)