Johannes Crellius

of London (1658-), Samuel Crellius (1660–1747) and Paweł Crell-Spinowski (1677-), as well as his great-grandsons in Georgia, United States, were all proponents of Socinian views.

Crellius moved to Poland at the age of 22, and quickly became known as one of the chief theologians of the Socinians, also known as Polish brethren.

These and others then appeared as Vol.III-V of Frans Kuyper's Bibliotheca Fratrum Polonorum quos Unitarios vocant ("Library of the Polish Brethren called Unitarians") Amsterdam 1668[2] Crell also featured in Christopher Sand's bibliography and biographical collection Bibliotheca antitrinitariorum (1684).

These works were widely distributed being owned by Voltaire, John Locke and other Enlightenment thinkers.

It was re-titled The Unity of God Answered and Defended, but with the exception of the title page it was identical to the first edition.