The modern custom, however, cannot be shown to be descended from pagan tradition directly. Its origins can be traced to 16th century Germany: Ingeborg Weber-Keller (Marburg professor of European ethnology) identified as the earliest reference a Bremen guild chronicle of 1570 which reports how a small fir was decorated with apples, nuts, dates, pretzels and paper flowers, and erected in the guild-house, for the benefit of the guild members' children, who collected the dainties on Christmas day. During the 17th century, the custom entered family homes. One Strasbourg priest, Johann Konrad Dannerhauer, complains about the custom as distracting from the word of God. By the early 18th century, the custom had become common in towns of the upper Rhineland, but it had not yet spread to rural areas. Wax candles are attested from the late 18th century. The Christmas tree remained confined to the upper Rhineland for a relatively long time. It was regarded as a Protestant custom by the Catholic majority along the lower Rhine, and was spread there only by Prussian officials who were moved there in the wake of the Congress of Vienna in 1815. In the early 19th century, the custom became popular among the nobility and spread to royal courts as far as Russia. Princess Henrietta von Nassau-Weilburg introduced the Christmas tree to Vienna in 1816, and the custom spread across Austria in the following years. In France, the first Christmas tree was introduced in 1840 by the duchess of Orleans.