Jacob Pakalomattam (died 1596) was an Archdeacon of the Saint Thomas Christian community in India in the years preceding the Synod of Diamper in 1599.

[2] Archdeaconate was not just an ecclesiastical institution, but a socio-political and ethno-religious, princely authority, that represented the integrity of the Christian community of Hendo (India).

[2] Following this, the Roman Catholic Inquisition also captured Mar Joseph and sent him to Lisbon from where he reached Rome to meet the pope.

[2] Mar Simeon was captured by Franciscan missionaries in 1584 and sent to Rome where his priestly orders were declared invalid and forced to remain until his death in 1559.

[1] Although the missionaries were successful in this, the presence of the rebellious Archdeacon Jacob who according to them resisted all attempts of latinisations, forced them to let Mar Abraham to govern the Malabar Christians until his death in 1597.

[1] Archdeacon Jacob maintained his authority and support among the native Christians even after Mar Simeon had been deported to Portugal.

[5][4][6] Archdeacon Jacob rejected the Gregorian Calendar and taught his followers to recite the traditional Chaldean raza without the Latin interpolations.

[2][1] Dom Alexis de Menezes, the Archbishop of Goa and the mastermind of the Synod of Diamper, wrote to him that Mar Simeon had been convicted and his orders were declared invalid by the pope in Rome, in attempt to force the archdeacon to submit to the Papal authority and even offered him large promises and favours in return.