The Law of Dawning Suns is considered the First Tinrisian World Law. In short, the Law of Dawning Suns sets forth the conditions by which Adris and Tesulild were brought to life and thereby provide the conditions conducive to life on the surface of Tinris.
During the formative years of pre-history, it is doctrinally believed that the Patrons of Tinris met to outline the conditions They believed would allow for the greatest chance of successful worldbuilding. After much discussion, it was determined that two suns would provide an "Unbroken Day", a result that was achieved by the Dalerunner's sponsorship and Her divine will that enforces this Law. It is for this reason that one of the Dalerunner's deednames is Sunlighter.