The history of Bihar is one of the most varied in India. Bihar consists of three distinct regions, each has its own distinct history and culture. They are Magadha, Mithila and Bhojpur. Chirand, on the northern bank of the Ganga River, in Saran district, has an archaeological record dating from the Neolithic age (c. 2500 – 1345 BC). Regions of Bihar—such as Magadha, Mithila and Anga—are mentioned in religious texts and epics of ancient India. Mithila is believed to be the centre of Indian power in the Later Vedic period (c. 1100 – 500 BC). Mithila first gained prominence after the establishment of the ancient Videha Kingdom. The kings of the Videha were called Janakas. A daughter of one of the Janaks of Mithila, Sita, is mentioned as consort of Lord Rama in the Hindu epic Ramayana. The kingdom later became incorporated into the Vajjika League which had its capital in the city of Vaishali, which is also in Mithila.
Magadha was the centre of Indian power, learning and culture for about a thousand years. One of India's greatest empires, the Maurya Empire, as well as two major pacifist religions, Buddhism and Jainism, arose from the region that is now Bihar. Empires of the Magadha region, most notably the Maurya and Gupta Empire, unified large parts of the Indian subcontinent under their rule. Their capital Pataliputra, adjacent to modern-day Patna, was an important political, military and economic centre of Indian civilisation during the ancient and classical periods of Indian history. Many ancient Indian texts, aside from religious epics, were written in ancient Bihar. The play Abhijñānaśākuntala being the most prominent.
The present-day region of Bihar overlaps with several pre-Mauryan kingdoms and republics, including Magadha, Anga and the Vajjika League of Mithila. The latter was one of the world's earliest known republics and had existed in the region since before the birth of Mahavira (c. 599 BC). The classical Gupta dynasty of Bihar presided over a period of cultural flourishing and learning, known today as the Golden Age of India.
The Pala Empire also made their capital at Pataliputra once during Devapala's rule. After the Pala period, Bihar played a very small role in Indian history until the emergence of the Suri dynasty during the medieval period in the 1540s. After the fall of the Suri dynasty in 1556, Bihar again became a marginal player in India and was the staging post for the British colonial Bengal Presidency from the 1750s and up to the war of 1857–58. On 22 March 1912, Bihar was carved out as a separate province in the British Indian Empire. Since 1947 independence, Bihar has been an original state of the Indian Union.
Neolithic (10,800–3300 BC)
The earliest proof of human activity in Bihar is Mesolithic habitational remains at Munger.
Prehistoric rock paintings have been discovered in the hills of Kaimur, Nawada and Jamui. It was the first time that a Neolithic settlement was discovered in the thick of the alluvium, over the bank of the Ganges at Chirand. The rock paintings depict a prehistoric lifestyle and natural environment. They depict the sun, the moon, stars, animals, plants, trees, and rivers, and it is speculated that they represent love for nature. The paintings also highlight the daily life of the early humans in Bihar, including activities like hunting, running, dancing and walking. The rock paintings in Bihar are not only identical to those in central and southern India but are also akin to those in Europe and Africa. The rock paintings of Spain's Alta Mira and France's Lascaux are almost identical to those found in Bihar.
Bronze Age (3300–1300 BC)
Parallel to Indus Valley Civilization
In 2017 bricks dated to mature Harappan period were discovered from the outskirts of the ancient city of Vaishali. Any in depth research which may establish definite links between Indus Valley Civilization and Bihar is yet to be conducted. A round seal excavated from Vaishali dated 200 BC-200 AD has three inscribed letters which according to Indus Valley Civilization scholar Iravatham Mahadevan represents formulas inscribed on the Indus seals and dates it to the earliest layers of excavation i-e 1100 BC.