[1] There is no evidence for the theory that migrating Low Franconian settlers were responsible for the change to Old Dutch in the 12th and 13th centuries.[citation needed] During the Eighty Years' War, especially after 1585, the Sack of Antwerp and the 1580s successes of the Duke of Parma made between 100,000 and 200,000 of Brabantish and Flemish, many Calvinist, settle in the cities of Holland proper.[citation needed] That certainly slowed linguistic change by the influence on spoken language of the very conservative written standard.However, people who speak Zaans, West Frisian or Waterlands are able to understand one another better than outsiders because all three dialects use similar words.Utrechts-Alblasserwaards, spoken in the area immediately east of the coastal districts, is considered to be a subdialect of Hollandic or a separate dialect.