Agroha took its name from King Agra. Archaeological evidences tell us that the town was established earlier than fifth century before Christ. Kushan and Yaudheya coins, bricks with designs of human heads with typical hair styles, terracotta seals and sculptures are among the finds discovered. It is believed to be the birthplace of the Agrahari and Agrawal communities. Ancient structures, pot-shards, coins and seals have been found in archaeological excavations. Agroha was the capital of legendary Emperor Agrasen.
Three thousand years back, Agroha was the kingdom of Maharaja Agrasen. The Agroha Mound or `Ther` is situated about 1.5 km away from the present Agroha village. Buried under this mound are the remains of the ancient town. Its excavation was started in the year 1888-89. It was at this time that people came to know about this great kingdom. Agroha is situated in the district of Agroha Haryana and in it lies buried the ruins of the capital of the Agroha State. The ancient Agroha town existed some hundred years before the Kushan dynasty. Once the state was renowned for its prosperity. As time passed it could not stand the invasions of Greeks, Yavanas and Hunas. The invasions led to the migration of Agroha residents to other parts of India like Rajasthan, Uttar Pradesh, Punjab and Malwa. They people got the common name Aggarwals that means Agroha-Wale. From the excavations it is clear that below the mounds existed a big, well planned and progressive town. Large number of silver and bronze coins of different shapes and sizes has been discovered from the excavated site. The scripts on the coins prove that they belong to different periods. Statues made of stone and sand was also excavated from the site. There are many utensils belonging to the 2nd century BC.
The Agroha Mountain goes back to the 3rd century BC and it is the place where Harappan coins were discovered apart from stone sculptures, terracotta seals, iron and copper implements, shells etc. The Agroha mound consists of the Agroha Temple Complex on one side and the Sheela Mata Temple on the other side.
It was in these lands that the very first evidence of the presence of man was discovered with the excavation of Agroha, Banawali and Kunal. All of these were the pre-Harappan settlements, bringing for us the very first images of prehistoric times. The presence of the pillar in the Hisar Fort belonging to the time of Emperor Ashoka (234 BC) was originally from Agroha. The discovery of coins of the Kushan Kings tells tales of ancient India.
The Varhneyas, a section of the vaishy community, known as Barah-Senis in Uttar Pradesh, who claim Agroha as their original home, are believed to be the descendants of the ancient Vrishnis.  Vrishni was born as eldest son of Maharaja Madhu in 19th generation of Yadu, the son of Yayati. He is a Chandravanshi Jat kshatriya. Vrishnis were the descendant of Vrishni. Krishna belonged to this branch of the Chandravanshi of Vrishnis from whom he got the name Varshneya. 
छठी शताब्दी में जाट राजा हर्षवर्धन उत्तर भारत के सर्वशक्तिमान् सम्राट् थे जिनके राज्य-प्रबन्ध की प्रशंसा चीनी यात्रियों ने भी की है । इन्हीं के राज्य में बाण जैसा कवि था जिसके सम्बन्ध में प्रसिद्ध है कि "बाणोच्छिष्टं जगत् सर्वम्" । संस्कृत साहित्य का कोई ऐसा शब्द न होगा जिसका बाण ने प्रयोग न किया हो । सौलह सौ वर्ष पूर्व उत्तर भारत में जाटों के अनेक उदाहरण थे जिनमें रोहतक का यौधेयगण राज्य सर्वाधिक प्रसिद्ध था । यहाँ के वीर क्षत्रियों ने अपने रक्त की अन्तिम बूंद तक बहाकर पंचायती राज्य की रक्षा के लिए अकथनीय बलिदान दिये । उनके समृद्धिशाली राज्य की कहानी रोहतक का खोखरा कोट पुकार-पुकार कर कह रहा है । थानेसर, कैथल, अग्रोहा, सिरसा, भादरा आदि इनके प्रसिद्ध जनपद थे । 
- Hukum Singh Panwar (Pauria):The Jats:Their Origin, Antiquity and Migrations, Manthan Publications, Rohtak. ISBN 81-85235-22-8 , p.82
- Dr Mahendra Singh Arya, Dharmpal Singh Dudi, Kishan Singh Faujdar & Vijendra Singh Narwar: Adhunik Jat Itihasa (The modern history of Jats), Agra 1998
- देशभक्तों के बलिदान: सम्पादक - स्वामी ओमानन्द सरस्वती
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