Shrirvai rashtram / Rashtram vai ashvamedhah / Tasmat rashtri ashvamedhena yajet / Sarva vai devatah ashvamedhe anvayatta / Tasmat ashvamedha yaji sarva disho abhijayati / - Shatapatha Brahmana (13/1/2/9/3)
Meaning: Prosperity is truly Rashtra. Rashtra is indeed Ashvamedha. Persons dedicated to Rashtra should perform Ashvamedha. Certainly all the gods participate in Ashvamedha. The convener of Ashvamedha is victorious everywhere.
The description of several such victorious kings is found in ancient Indian history, who, by their laudable efforts, not only expanded the glory of divine
culture but they also succeeded in awakening the
divinity in the people of their nations. A description of Avikshita, the son of Suvarcca is found in the Ashvamedhika Parva of Mahabharata. Religious, steady and ascetic king Avikshita whose other name was Karandhama also performed one hundred Ashvamedhas. The author of Mahabharata praises his prowess by saying. "Ya ijeha -yamedhanam shatena vidhivat prabhuh". Similarly the Ashvamedhas of Maruta-Mandhata have been described in detail in the Puranas.
Shrimad Bhagwat Mahapurana describes the vow taken by king Prithu (who invented new techniques of making Prithvi - the earth, fertile) to perform one hundred Ashvamedhas and its beneficent results. According to this scripture
Adhadikshita raja tu hayamedha shatena sah /
Brahmavarte manorkshetre yatra praci Saraswati //
-Bhagvata, 4th Skandha, Adhyaya -29 /1.
Meaning – After that Prithu took a vow to perform one hundred Ashvamedha yajnas at Brahmavarta region of Manu where the river Saraswati flows westward.
Similarly Bharata the son of Rishabhadeva, after whom this country has been named as Bharatavarsha, performed hundreds of Ashvamedha yajnas according to prescribed methods. These were not ordinary yajnas, rather
Dravya desha kalavayashshuddh-tvigddhodyeshopacitaih
Sarverapi kritobhiryadhopadesham shatkritva iyaj /
Meaning -Each of these yajnas were performed with grandeur in terms of wealth, time and place, vigour, faith, Priests, etc.
-Bhagavata 5/4/16
The author of the Purana, mentioning the case of Ambarisha, who despite being a king became a sage by performing Ashvamedha Anushthana, says - Þje ashvamedhairadhi vajnmishvaram,