In a land area of 2,000 square kilometers, the archdiocesan territory includes North: Bharathapuzha in Malappuram district and Trichur - Palakkad district boundary; West: Arabian Sea; East: Trichur district boundary; South: Southern boundary of Valapad village and Karuvannur, Karanchira, Kurumali, Mupliyam river. The Ecclesiastical Province of Thrisure formerly Trichur comprises the Metropolitan Thrissur archdiocese with suffragan Dioceses of Irinjalakuda and Palakkad.

The Ecclesiastical Province capital is Thrissur, the cultural capital of Kerala, southern state of India. It's also known temple town where majority of the population are Hindus.

The Christianity of Trichur traces its origin back to the Apostolate of St. Thomas, who landed at Crangannore (Kodungallur) in the present district of Trichur in the year 52 AD. According to tradition he founded the first Church in India at Palayoor. The present Archdiocese of Trichur was begun as a Vicariate Apostolic on May 20, 1887 and was erected as diocese in 1923 and a Metropolitan See in 1995. It was the biggest diocese in India in Catholic population until the dioceses of Palghat and Irinjalakuda were bifurcated in 1974 and 1978 respectively. The significance of Trichur as the cradle of Christianity in India, the most ancient diocese of the Syro-Malabar Church, the cultural capital of Kerala and the centre of religious harmony was reiterated during the visit of Pope John Paul II in 1986.

The word 'Trichur' is the anglicized form of the Malayalam name of the town 'Thri-Siva-Perur', meaning the town of Lord Siva. The name is appropriate, for Trichur derives its main glory from Vadakunnathan Temple, (Vadakunnathan, Lord of the North, is a name of Siva) that dominates the topography of the town.

Vadakkunnathan Temple is ascribed to Parasurama, the legendary hero who is said to have reclaimed Kerala from the sea by a miraculous feat. In historical times it was a suburb of Musiris (present Cranganore) the capital of the ancient Chera Empire, an international Emporium where most of the ancient trading nationals of the world had their settlements. From very early times Trichur has been a centre of learning and, with the decline of Buddhism and Jainism and the establishment of the supremacy of Brahminism during the revival of Hinduism.

Trichur became an important centre of Sanskrit learning. The great Hindu philosopher Sankaracharya had taught Advaita here. Hindu philosopher Adi Shankara (possibly 788 - 820 BC) "the first Shankaracharya in his lineage, was the first philosopher to consolidate the doctrine of advaita vedanta, a sub-school of Vedanta. His teachings are based on the unity of the soul and Brahman in which Brahman is viewed as without attributes. Adi Shankara is regarded as an incarnation of Shiva.

Adi Shankara toured India with the purpose of propagating his teachings through discourses and debates with other philosophers. He founded four monasteries which played a key role in the historical development, revival and spread of post-Buddhist Hinduism and Advaita Vedanta. His works in Sanskrit, all of which are extant today, concern themselves with establishing the doctrine of Advaita (Sanskrit: "Non-dualism"). After his travels in different regions of India he is believed to have come back and settled in Trichur and died here.

Climate
Thrissur basically enjoys 4 types of climate such as winter, summer, South West Monsoon and North East Monsoon. The coastal areas record a maximum temperature of 32 degree Celsius and a minimum of 22 degree Celsius. The interiors record a maximum of 37 degree Celsius during summer. In the coastal area it is hot and humid during April-May while cool during December-January.

Topography
Thrissur is located at the central of Kerala state with a coastal line.

Language
Malayalam language is in use. English, a mandatory subject in public schools, is widely spoken and understood.

The website of Trichur Archdiocese is available at: www.trichurarchdiocese.org