Between the 13th and 19th centuries, Baltic Germans, many of whom were originally of non-German ancestry but had been assimilated into German culture, formed the upper class. They developed distinct cultural heritage, characterised by both Latvian and German influences. It has survived in German Baltic families to this day, in spite of their dispersal to Germany, the United States, Canada and other countries in the early 20th century. However, most indigenous Latvians did not participate in this particular cultural life. Thus, the mostly peasant local pagan heritage was preserved, partly merging with Christian traditions. For example, one of the most popular celebrations is Jāņi, a pagan celebration of the summer solstice—which Latvians celebrate on the feast day of St. John the Baptist.