Syro-Malabar Catholic Diocese of Palghat in Central Kerala extends to some regions in the neighbouring state of Tamil Nadu.

The Archeparchy of Trichur was founded on 20 May 1887 by Pope Leo XIII by his papal bull Quod Jam Pridem now covers an area of 2000 Sq.Km and has a Catholic population of about 460848.

The diocese was founded on 20 May 1887 by Pope Leo XIII by his papal bull Quod iam pridem.

The boundaries of diocese were from Periyar (river) in Aluva to Bharathappuzha.

Medlycott has given a description about the state of facilities for education in the vicariate on his arrival in 1887 and on his return in 1896 as below: The Vicariate of Trichur had a Catholic Syrian population of 108,422 with eighty-three parish churches and twenty-two chapels-of-ease, served by 118 priests of the Syrian Rite, besides 23 Syrian Carmelite Tertiary monks, in two monasteries; there was also a convent of 24 native Tertiary nuns with a middle-class school of 33 girls.