Question: Mennonites are traditionally multilingual with which Low Prussian dialect of East Low German, with Dutch influence language was their first?
Sentence (from "Plautdietsch language"): Plautdietsch or Mennonite Low German, was originally a Low Prussian dialect of East Low German, with Dutch influence, that developed in the 16th and 17th centuries in the Vistula delta area of Royal Prussia.
Relevant evidence: Yes