hola
from my perspective (and only mine) i consider James, the Just brother of our Lord to be one of the most influencial patriarchs of the Church... probably the most influencial.
if you begin to talk to non Christians there are some (muslims especially) who believe that St. Paul corrupted Christianity and drew it away from judaism... this is based upon a misunderstanding of traditional jewish law and a misunderstanding of the characters involved at the council of jerusalem (from which we gained the didache).
st. paul argued that the gentile christians need not be circumcised or follow the 613 jewish mitzvot... st peter argued that they had to... st. James the Just decided, as the authority, that the gentile converts did not need to since they were not part of the jewish covenant.
this was extremely ahead of its time in jewish and christian thinking... today jews consider this a natural presumption... since gentiles are not jews they do not need to follow their covenant, but instead must follow the (less restrictive, but more general) rules of the noahide covenant between God and all humanity. this was, in effect, James' ruling... almost 1200 years before maimonides... such was James' knowledge of the law.
he was a wise, compassionate and understanding father of the Church... worthy of being the (adoptive) brother of our Lord. alongside our beloved St. Peter, first of the roman patriarchs and our beloved St. Paul, apostle to the gentiles, i think St. James the Just is a pillar of our Church and a brother of our Lord.
*he's also on my list of people to whom i must introduce myself if i ever see heaven

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que Dios te bendiga