Kosala, an ancient Indian region, corresponding roughly in area with the region of Oudh in the present day Uttar Pradesh state
It is mentioned as a region in the later texts of the Satapatha Brahmana and the Kalpasutras.
At this very period there was a ruler of the land of Anga known by the name of Romapada who was a friend of Kosala king Dasaratha.
The epic Mahabharata mentions that the king of the name Asmaka was the adopted son of Saudasa alias Kalmashapada a king of Kosala and an Ikshwaku ruler.
Chandrakanta, a city supposedly found by Lakshmana, after he colonized the Vanga kingdom (see Kosala Kingdom)
Chetaka, called King Chetaka or President Chetaka was the representative of the Licchavi clan who ruled as a Republican President in Vaishali (India) reputed to have organised the Vajjian confederation of republics comprising the 9 Mallakis, 18 Gana Rajas of Kashi/Kosala and 9 Licchavi Republics.
It was from here that the Rakshasa Khara attacked Raghava Rama of Kosala, who lived with his wife and brother at Panchavati (modern day Nashik), not far away.
Samudragupta is presumed to have conquered the region, as in his Allahabad inscription, it has been mentioned that, he had conquered Mahêndra of Kôsala, Vyâghraraja of Mahâkantâra, Mantarâja of Kêrala, Mahêndra of Pishtapura, Svâmidatta of Kottûra on the hill, Damana of Êrandapalla, Vishnugôpa of Kâñchi, Nîlarâija of Avamukta, Hastivarman of Vengî, Ugrasêna of Palakka, Kubêra of Dêvarâshtra, Dhanamjaya of Kusthalapura, and others.
In context of Krsna digvijay, the Mahabharata furnishes a key list of twenty-five ancient Janapadas, viz., Anga, Vanga, Kalinga, Magadha, Kasi, Kosala, Vatsa, Garga, Karusha, Pundra, Avanti, Dakshinatya, Parvartaka, Dasherka, Kashmira, Ursa, Pishacha, Mudgala, Kamboja, Vatadhana, Chola, Pandya, Trigarta, Malava, and Darada (MBH 7/11/15-17).
Dakshina Kosala Kingdom, a colony of Kosala kings identified to be the Chhattisgarh state and western Orissa region of India
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Kosala Kingdom or Uttara Kosala, a kingdom mentioned in the ancient Indian texts
King Vrihadvala of Kosala, supported Duryodhana in the Kurukshetra War
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Vriahadvala was a Kosala king mentioned as a general under Duryodhana, in the Kurukshetra War.
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During the time of Kurukshetra War, and the reign of Pandavas and Kauravas, we find mention of numerous kingdoms with the name, Kosala (as per the references in Mahabharata).
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It seems that this Kosala had its power extended to the neighbouring kingdom of Kasi to the south of it, because Vrihadvala sometimes commanded the troops from Kasi also in Kurukshetra War.
Bhagvatam Purana attests that the prince of Madra along with princes from Matsya, Usinara, Kosala, Vidharbha, Kuru, Srnjaya, Kamboja, Kekaya, Kunti, Anarta, Kerala was present at Samanta-pancaka at the occasion of the solar eclipse.
They then crossed the delightful Sarayu and saw the country of Eastern Kosala.
The famous Nishada king named Guha who befriended the Kosala prince Raghava Rama was also was the king of this kingdom.
These five hordes were military allies of the Haihaya or Taljunga Kshatriyas of the Yadava line, and were chiefly responsible for dethroning King Bahu of Kosala.