Royal decrees sound like they would deal with events of national importance. However, in the past, Kings and Queens dealt with many matters of personal importance to their subjects. They may have given dispensation for a marriage, authorized a pension, or naturalized a foreign-born citizen. I am often surprised to learn how many events in the lives of our ancestors went up the government chain of command, all the way to the monarch.
See the article about Royal Decrees for more information on how to use this source.

Royal Decree giving permission to Hendrik Woordes and Janna Geertruid Drappers [sic] to be married