Reference

Santiago Fonacier was a significant figure in the Philippine Independent Church (Iglesia Filipina Independiente, or IFI), particularly noted for his contributions as the second Supreme Bishop from 1940 to 1946. His major contributions include:

1. Leadership as Obispo Maximo: Fonacier served as the leader of the IFI during a critical period in its history. During his tenure, he is known for his administrative and leadership roles which helped shape the church's direction post the tenure of the first Supreme Bishop, Gregorio Aglipay.

2. Formation of Independent Church of Filipino Christians (ICFC): Fonacier seceded from the IFI to form an offshoot, the Independent Church of Filipino Christians. This move was part of the denominational shifts and schisms that occurred within the church during his leadership.

3. Political and Nationalist Involvements: Fonacier was involved in politics and was known for his nationalist stances, advocating for Filipino leadership in religious and political spheres. His nationalist views were crucial during the time when the church was asserting its independence from colonial influences.

For more details, you can visit the Wikipedia page on the Philippine Independent Church.