 The refugees who reached Amsterdam published the "Bibliotheca fratrum polonorum" (1665–1669), with the assistance of the Prussian emigre Christopher Sandius, embracing the works of Johannes Crellius, their leading theologian, Jonasz Szlichtyng, their chief Biblical commentator, Fausto Sozzini and Johann Ludwig von Wolzogen.The title page of this collection, bearing the words "quos Unitarios vocant", introduced the term "Unitarian" to Western Europe.The term Unitarian (in Latin) was first used by Polish and Dutch Socinians from the 1660s.