Book excerpt: The political and economic rise of this small but influential community of New Christian bankers and merchants is analysed against the backdrop of its institutional dynamics, in an overall perspective never before conceived. The political, religious, economic, legal, charitable and disciplinary history of the community is thus explored through the analysis of the richly detailed protocol books, written between 1652 and 1682. This is the intimate and fascinating journey of their everyday lives, hopes and challenges, as brought to us by their leaders.