The widespread use of agile methods shows a fundamental shift in the way organizations try to cope with unpredictable competitive environments. In large-scale agile settings, multiple development activities need to be coordinated to achieve desirable enterprise-wide effects and agility. A powerful instrument to effectively guide and steer large-scale agile endeavors is the formulation and usage of architecture principles. Despite their raison d'être to guide large organizational transformations, extant studies on how principles can be used to support large-scale agile transformations are still lacking.