The Synods of Aachen between 816 and 819 were a landmark in regulations for the monastic life in the Frankish realm. The Benedictine Rule was declared the universally valid norm for communities of monks and nuns, while canonical orders were distinguished from monastic communities and unique regulations were laid down for them: the Institutio canonicorum Aquisgranensis. The synods of 817 and 818/819 completed the reforms. Among other things, the relationship of church properties to the king was clarified.