Ganga is also known as Bhagirathi, a testimony to Bhagirath's pious perseverance. 

In the Ramayana and Mahabharata, and in puranic literature, innumerable stories abound about the warrior-Kings of Ayodhya who are upholders of dharma. But when they strayed from the path of righteousness, they too had to pay the price for it.
The law of karma admits no distinction. 

The dilemmas of dharma, the dangers of adharma, the need for perpetual vigilance to avoid sinful conduct are the eternal moral codes of Hinduism epitomised in the lives of these illustrious Suryavanshi Kings.

The epic Ramayana celebrates his life as he is born to King Dashrath-II in Ayodhya in the state of Kosala. An introductory verse in the epic says, "He who reads and repeats this holy life-giving Ramayana is liberated from all his sins and exalted with all his posterity to the highest heaven."

Ram's graceful frame and virile beauty, his strength and courage, the purity of his heart, his compassion and deep wisdom and his statesmanship make him the ideal Kshatriya King. 

With his wife, Sita, Ram is the embodiment of purity, tenderness and conjugal affection. 
With his brothers - Lakshman, Bharat and Shatrughan - he exemplifies respect and trust within the family. 
With his enemies, Ram is the personification of the powerful Kshatriya King, adhering to dharma and not cowering before evil. 

He is thus revered as Maryada Purshottam, one who is the upholder of the finest traditions of Mankind. 

Ram manifests the establishment of Hindu dharma in society and polity. This is Ram-Rajya, the epitome of the monarchical state. 

Ram's greatest virtue is in upholding the duties of the King even as he experiences hardships, sorrow and conflicts of life on earth.  His triumph over the forces of evil, personified by Ravana of Lanka, is the hope for the world. 

The kingdom of Kosala reaches its zenith in the reign of Ram. 

Kush and Lav become kings of south and north Kosala. Kush builds Kusathali in the Vindhyas and Lav reigns at Shravasti.

Kosala recedes in importance after Ram's departure.

Videha, Anga and Magadha in the east, Kekaya, Sindhu, Sauvira in the north, Saurashtra in the west and the Dakshinatya states gain in might and importance.