1855–1872
Fr Joseph Grégoire, apostle of Vadakkankulam
For some seventeen patient years the work was driven by Fr Joseph Grégoire SJ, the man who gave this community a church one historian called "probably without equal in the world." It is his Jesuit chronicler Auguste Jean, and he alone, who calls him "the apostle of Vadakenkoulam." The Jesuit lay-brother Joseph Bergenthal engineered its twenty-four self-supporting arches, turned in lime and palm-toddy mortar without cement, iron, or a single wooden beam to hold them.
In English
"Fr Joseph Grégoire… Vadakencoulam. — COADJUTORS: Joseph Bergenthal, builder of the church… Vadakencoulam."
What this source establishes
The single best fact on this page, and it is documented in ROME: the Society's own 1872 catalogue lists Br Joseph Bergenthal as "Ædif. eccl." — builder of the church — at Vadakencoulam, in the very year it was blessed. He appears NOWHERE on the open web. He also sits under COADIVTORES with no "P." prefix, which confirms he was a lay brother, not a priest.