Caulacau is a sacred word (handed down with varieties of spelling, apparently a corruption from קִו לָקָו, "precept upon precept," Isa 28:10) in some of the Gnostic systems. The first mention of the name is found in the account given by Irenaeus (1, 24) of the Basilidians. Theodoret (Haer. Fab. 1, 4), borrowing his account from Irenseus, says that it was to the Lord and Saviour that they gave the name Caulacau. The next mention of the word occurs in the earlier work of Hippolytus, on heresies, where it is named under the heading of the Nicolaitans. By some of these it was applied to a certain archon (Epiphanius, Haer. 25); but according to Philastrius (Her. 33), to mankind. In the later work of Hippolytus, Refutation of all Heresies, the use of Caulacau is ascribed to the Naasenes, who used the word "man" in speaking of the principle of the universe. This principle they held to be threefold, and Hippolytus says that they gave the name Caulacau to the blessed nature of the heavenly man (the Adam above), Saulasau to the mortal nature below, and Zeesar to that of those who had been raised from earth to receive the heavenly birth, by which it is to be supposed their own disciples are indicated.