Theory of evolution.
Law of gravity.
Hmmm. . .evolution is not a law. Apparently, it's not such an established fact after all.
You are aware that scientific laws are no more "established facts" than scientific theories, aren't you? That is to say in science a theory doesn't "graduate" to become a "law" when the evidence becomes persuasive.
In science, "laws" are descriptive and "theories" are explanatory. A "law" nothing more than a statement of some empirically observed relationship (hence it is descriptive in nature), while a "theory" is explanatory, in that it is a conceptual framework explaining the mechanics behind a range of related phenomona.
BOTH are held tentatively, pending the potential discovery of refuting evidence.