Several authors had a hand in drafting the Catechism: Valentinus Smalcius, Hieronim Moskorzowski, Johannes Völkel and others.
It is likely that some of the text had been prepared by the Italian exile Fausto Sozzini, who had settled among the Polish Brethren in 1579, without ever formally joining, and who died in the year before the Catechism was drafted.
The Ecclesia Minor survived in Poland until 1658 when it was outlawed by the Polish Sejm in the Roman Catholic Counter-Reformation.
These nontrinitarians, and their Catechism, would later become known as Socinians due to the prominence given to Fausto Sozzini's writings after his death in the series Bibliotheca Fratrum Polonorum published in Amsterdam 1665 and widely circulated in England and elsewhere.
[3] Preface The most distinctive element in Socinian, as opposed to Arian, Christology is the rejection of the personal pre-existence of Christ.