Why were Hittite royal decrees and treaties placed under the protection of national deities?

In the context of Anatolian religion, Hittite royal decrees and treaties were placed under the protection of national deities because the Hittite king served as the earthly deputy of the gods, particularly the weather god.1

The state religious cult, which was centered at the capital of Boğazköy, integrated the king's authority with divine oversight. By invoking national deities, these legal and political documents were sanctified, ensuring that the agreements were upheld under the authority of the divine powers that governed the land and bestowed victory in war. This practice reflected the broader Hittite theological view that the king and all significant state matters were subject to the will and protection of the gods, who were regarded as the ultimate arbiters of the nation's well-being.234