sentences:  Emma's elder sister was Judith, who in February 819 married the Carolingian emperor Louis the Pious, and thereby became Queen consort of the Franks and Holy Roman Empress.The marriage marked a crucial step forward in the rise of the Welf dynasty.In 827, probably at the instigation of Judith, Hemma married Louis the German, the youngest son of Emperor Louis the Pious from his first marriage with Ermengarde of Hesbaye, and stepson of Hemma's sister Judith.