What is the fine-grained topic of the following text: According to popular legend (at this point, dad pauses and take a mysterious tone) when Lord Rama returned from his 14 years of exil after defeating Raavana, the people of Ayodhya lighted candles and diya** to celebrate his return to the kingdom. Only return the topic.
The legend of Lord Rama's return from exile and the celebration in Ayodhya.