Kosala (, , sometimes referred to as Uttara Kosala () was one of the Mahajanapadas of ancient India. It emerged as a small state during the Late Vedic periodMichael Witzel (1989), Tracing the Vedic dialects in Dialectes dans les litteratures Indo-Aryennes ed. Caillat, Paris, 97–265. and became (along with Magadha) one of the earliest states to transition from a lineage-based society to a monarchy. – Interestingly, in the transition from lineage-based societies to states, it is Magadha and Kosala which emerge among the earlier states that move towards kingdoms. By the 6th century BCE, it had consolidated into one of the four great powers of ancient northern India, along with Magadha, Vatsa, and Avanti.Vikas Nain, "Second Urbanization in the Chronology of Indian History", International Journal of Academic Research and Development 3 (2) (March 2018), pp. 538–542 "Many of the sixteen kingdoms had coalesced into four major ones by 500/400 BCE, by the time of Gautama Buddha. These four were Vatsa, Avanti, Kosala, and Magadha."

Kosala belonged to the Northern Black Polished Ware culture (c. 700–300 BCE) and was culturally distinct from the Painted Grey Ware culture of the neighboring Kuru-Panchala region, following independent development toward urbanisation and the use of iron. The presence of the lineage of Ikshvaku—described as a raja in the Ṛgveda and an ancient hero in the Atharvaveda – There is a single reference in the Ṛgveda to Ikṣvāku as a rājā, and the Atharvaveda refers to him as an ancient hero.—to which Rama, Mahavira, and the Buddha are all thought to have belonged—characterized the Kosalan realm. – Manu’s eldest son, Ikṣvāku, the progenitor of the Sūryavaṃśa, had three sons, two of whom were important and established themselves at Kosala and Videha, contiguous territories in the middle Ganges plain and important to the narrative of the Rāmāyaṇa. The rulers of Kosala and Videha are therefore of collateral lines.

One of India's two great epics, Ramayana, is set in the "Kosala-Videha" realm in which the Kosalan prince Rama marries the Videhan princess Sita.

After a series of wars with neighbouring kingdoms, it was finally defeated and absorbed into the Magadha kingdom in the 5th century BCE. After the collapse of the Maurya Empire and before the expansion of the Kushan Empire, Kosala was ruled by the Deva dynasty, the Datta dynasty, and the Mitra dynasty.

Location Geography Kosala was bounded by the Gomti River in the west, Sarpika River in the south, Sadanira in the east which separated it from Videha, and the Nepal Hills in the north. It encompassed the territories of the Shakyans, Mallakas, Koliyas, Kālāmas and Moriyas at its peak. It roughly corresponds to modern-day Awadh region in India.

Cities and towns The Kosala region had three major cities, Ayodhya, Saketa and Shravasti, and a number of minor towns as Setavya, Ukattha, Dandakappa, Nalakapana and Pankadha. According to the Puranas and the Ramayana epic, Ayodhya was the capital of Kosala during the reign of Ikshvaku and his descendants. Shravasti is recorded as the capital of Kosala during the Mahajanapada period (6th–5th centuries BCE), but post-Maurya (2nd–1st centuries BCE) kings issued their coins from Ayodhya.

Culture Kosala belonged to the Northern Black Polished Ware culture (c. 700–300 BCE), which was preceded by the Black and red ware culture (c. 1450–1200 BCE until c. 700–500 BCE). The Central Gangetic Plain was the earliest area for rice cultivation in South Asia, and entered the Iron Age around 700 BCE. According to Geoffrey Samuel, following Tim Hopkins, the Central Gangetic Plain was culturally distinct from the Painted Grey Ware culture of the Vedic Aryans of Kuru-Pancala west of it, and saw an independent development toward urbanisation and the use of iron.

Religion Kosala was situated at the crossroads of Vedic heartland of Kuru-Panchala and Greater Magadhan culture. – Kosala thrived on the edge of both the Vedic world and Greater Magadha, where it formed an important center during the lifetimes of the Vedic sage Yājñavalkya as well as Sakyamuni Buddha. According to Alexander Wynne, Kosala-Videha culture was at the center of unorthodox Vedic traditions, ascetic and speculative traditions, possibly reaching back to the late Ṛgveda.Wynne, A. (2011). "Review of Johannes Bronkhorst. Greater Magadha: Studies in the Culture of Early India." Buddhism commissioned by David Arnold. Kosala-Videha culture is thought to be the home of the Śukla school of the Yajurveda.

According to Michael Witzel and Joel Brenton, the Kāṇva school of Vedic traditions (and in turn the first Upanishad, i.e., Bṛhadāraṇyaka Upaniṣad) was based in Kosala during the middle and late Vedic periods. Kosala had a significant presence of the muni tradition, After Janaka, when the Vajjis surpassed the Videhas, Kosala emerged as a major center of political power and muni religious activity. which included Buddhists, Jains, Ajivikas, Naga, Yakṣa, and tree worshipers as well as Vedic munis. The muni tradition emphasized "practicing yoga, meditation, renunciation and wandering mendicancy", in contrast to the ṛṣis who "recited prayers, conducted homa, and led a householder lifestyle".

According to Samuel, there is "extensive iconographical evidence for a religion of fertility and auspiciousness". According to Hopkins, the region was marked by a "... world of female powers, natural transformation, sacred earth and sacred places, blood sacrifices, and ritualists who accepted pollution on behalf of their community".

Jainism Kosala had a particularly strong connection with Jainism. Shravasti is often mentioned in Jaina sources. It is also called Chandrapuri or Chandrikapuri or Ārya Kṣetra, because Jaina texts state that two of their Tirthankaras were born here, namely Sambhavanatha (3rd of 24) and Chandraprabha (8th of 24). Shravasti is also known as the capital city of Kunala's kingdom.

Sambhavanatha is said to have had taken initiation, donated all his belongings, and broken his first fast in Shravasti after begging for alms from King Surendradatta. Munisuvrataswami, the 20th Tirthankara, visited Shravasti and initiated several members of the royal family. As per the Jaina text Jnatadharmakathah, Parshvanatha, the 23rd Tirthankara, also visited Shravasti and inspired several lay-followers to accept initiation.

Further, Shravasti is the place of the bitter arguments and meeting between Mahavira – the 24th Tirthankara, and Gosala Mankhaliputta – the founder of Ajivikas and a rival. According to the Jain texts, the Mahavira visited Shravasti many times and spent his tenth varsha monsoon season here before attaining omniscience. He was hosted by a wealthy merchant named Nandinipriya. Ancient Jain scholars such as Kapila, Maghavan and Keshi studied in Shravasti. At Shravasti, Jamāli, Mahavira's son-in-law, created the first of the eight heretical sects by opposing tenets of Jainism as taught by Mahavira himself. The eighth heretical sect, Digambara sect, was created by Sivabhuti at Rathavirapur. As described in the Jaina text Uttaradhyayana Sutra, the discussion between Keśiśramanācharya and Mahavira's first disciple, Gautama Swami, is said to have had taken place at Shravasti. This was the place where Upkeśa Gaccha was established by Keśiśramanācharya after he accepted Mahavira's conduct and became a white-clad monk along with all his disciples who were initially following Parshvanatha's conduct. Moreover, the Pattavali described in the Kalpa Sūtra, states the existence of "Śrāvastikā Śākhā", one of the four branches of the "Veṣavāṭikgaṇa" of the Jaina sangha. It had originated from Ācārya Kāmardhi, a disciple of Ācārya Suhastisuri, belonging to the beginning of the 3rd century BCE. Ācārya Jinaprabhasuri, in his Vividha Tirtha Kalpa confirms that a Jaina temple with an image of Sambhavanatha was renovated multiple times until it was finally completely desecrated during the reign of Alauddin Khilji.

Buddhism

Kosala had a particularly strong connection to the Buddha's life. Buddha introduced himself to the king of Magadha in the Suttanipata as a Kosalan. – According to the Suttanipāta, Gotama Buddha’s hometown was located in the region of Kosala, what is today eastern Uttar Pradesh. In the Pabbajjāsutta (Sn 3.1), Gotama Buddha explains his personal background to Magadhan King Bimbisāra, telling him that he hails from a country in Kosala. In the Majjhima Nikāya too, king Prasenajit refers to Buddha as a Kosalan. – In an account given in the Majjhimanikāya, King Pasenadi of Kosala calls the Buddha a Kosalan. He spent much of his time teaching in Śrāvastī, especially in the Jetavana monastery. According to Samuels, early Buddhism was not a protest against an already established Vedic-Brahmanical system, which developed in Kuru-Pancala realm, but an opposition against the growing influence of this Vedic-Brahmanical system, and the superior position granted to Brahmins in it.

Religious textual references In Buddhist and Jain texts

Mahavira, the 24th Tirthankara of Jainism taught in Kosala. A Buddhist text, the Majjhima Nikaya mentions Buddha as a Kosalan, which indicates that Kosala may have subjugated the Shakya clan, which the Buddha is traditionally believed to have belonged to.

In Vedic Literature

Kosala is not mentioned in the early Vedic literature, but appears as a region in the later Vedic texts of the Shatapatha Brahmana (7th–6th centuries BCE,"Early Indian history: Linguistic and textual parametres", in The Indo-Aryans of Ancient South Asia, edited by G. Erdosy (1995), p. 136 final version 300 BCEThe Satapatha Brahmana. Sacred Books of the East, Vols. 12, 26, 24, 37, 47, translated by Julius Eggeling [published between 1882 and 1900]) and the Kalpasutras (6th-century BCE).

In Puranas In the Ramayana, Mahabharata and the Puranas the ruling family of the Kosala kingdom was the Ikshvaku dynasty, which was descended from king Ikshvaku. The Puranas give lists of kings of the Ikshvaku dynasty from Ikshvaku to Prasenajit (Pali: Pasenadi). According to the Ramayana, Rama ruled the Kosala kingdom from his capital, Ayodhya.

History Pre-Mauryan

Koshala's first capital of Shravasti was barely settled by the 6th century BCE, but there is the beginnings of a mud fort. By 500 BCE, Vedic people had spread to Koshala.

By the 5th century BCE under the reign of King Mahakosala, the neighboring Kingdom of Kashi had been conquered. Mahakosala's daughter was the first wife of King Bimbisara of Magadha. As a dowry, Bimbisara received a Kashi village that had a revenue of 100,000. This marriage temporarily eased tensions between Koshala and Magadha.

By the time of Mahākosala's son Pasenadi, Kosala had become the suzerain of the Kālāma tribal republic, and Pasenadi's realm maintained friendly relations with the powerful Licchavi tribe which lived to the east of his kingdom.

During Pasenadi's reign, a Mallaka named Bandhula who had received education in Takṣaśilā, had offered his services as a general to the Kauśalya king so as to maintain the good relations between the Mallakas and Kosala. Later, Bandhula, along with his wife Mallikā, violated the sacred tank of the Licchavikas, which resulted in armed hostilities between the Kauśalya and the Licchavikas. Bandhula was later treacherously murdered along with his sons by Pasenadi. In retaliation, some Mallakas helped Pasenadi's son Viḍūḍabha usurp the throne of Kosala to avenge the death of Bandhula, after which Pasenadi fled from Kosala and died in front of the gates of the Māgadhī capital of Rājagaha.

At some point during his reign, Viḍūḍabha fully annexed the Kālāmas. That the Kālāmas did not request a share of the Buddha's relics after his death was possibly because they had lost their independence by then.