Very little is known about the true identity of Pseudo-Dionysius the Areopagite, a fifth or sixth-century mystic Christian writer. He as known as Pseudo-Dionysius because he wrote under the pseudonym "Dionysius the Areopagite," after the man in the Court of the Areopagus converted by St. Paul (see Acts of the Apostles 17,34).

The writings of Pseudo-Dionysis, although short, are at points seemingly impenetrable and have mystified many readers. After his meditation on the divine names, his most famous contribution to medieval theology is negative theology, which stresses the impotence of humans' attempt to penetrate the "cloud of unknowing."