A pantheist may believe in Law of Nature and go no further; a theist who accepts Law of Nature has a large instalment of natural theology ready made to his hand; including an idealist, or else an intuitionalist, scheme of ethics.
As a result of this, Kant is metaphysically a sort of pantheist.
Toland, the inventor of the name of pantheism, was notoriously, for a great part of his life, in some sort a pantheist.
Whether Xenophanes was a monotheist, whose assertion of the unity of God suggested to Parmenides the doctrine of the unity of Being, or a pantheist, whose assertion of the unity of God was also a declaration of the unity of Being, so that he anticipated Parmenides - in other words, whether Xenophanes's teaching was purely theological or had also a philosophical significance - is a question about which authorities have differed and will probably continue to differ.
Xenophanes was, then, a pantheist.