Conservative group in the USA and Canada arising from a division within the Swiss Brethren in Alsace under the leadership of Jakob Ammann (c. 1656-1730). Further divisions occured after the Amish migrated to North America, but most are members of the Old Order Amish Mennonite Church. Amish are similar to other Mennonites in doctrine and practice, but the former worship in private homes instead of a church, wear "plain" dress and retain the use of German in their services. There were about 35,000 baptised members in 1984.