Apocrypha are written works, often of unknown authorship or doubtful origin. In Christianity, the word apocryphal (ἀπόκρυφος) was first applied to writings which were to be read privately rather than in the public context of church services -- edifying Christian works which were not considered canonical Scripture. In the wake of the Protestant Reformation, the word apocrypha came to mean "false, spurious, bad, or heretical". From a Protestant point of view, Biblical apocrypha are a set of texts included in the Septuagint and the Latin Vulgate, but not in the Hebrew Bible. While Catholic tradition considers some of these texts to be deuterocanonical, and the Orthodox Churches consider them all to be canonical, Protestants consider them apocryphal, that is, non-canonical books that are useful for instruction. Luther's Bible placed them in a separate section in between the Old Testament and New Testament called the Apocrypha, a convention followed by subsequent Protestant Bibles. Other non-canonical apocryphal texts are generally called pseudepigrapha, a term that means "false attribution". Etymology The word's origin is the Medieval Latin adjective (secret, or non-canonical) from the Greek adjective , , (private) from the verb , (to hide away). It comes from Greek and is formed from the combination of (away) and (hide or conceal). The word apocrypha has undergone a major change in meaning throughout the centuries. The word apocrypha in its ancient Christian usage originally meant a text read in private, rather than in public church settings. In English, it later came to have a sense of the esoteric, suspicious, or heretical, largely because of the Protestant interpretation of the usefulness of non-canonical texts. Esoteric writings and objects The word apocryphal () was first applied to writings which were kept secret because they were the vehicles of esoteric knowledge considered too profound or too sacred to be disclosed to anyone other than the initiated. For example, the disciples of the Gnostic Prodicus boasted that they possessed the secret () books of Zoroaster. The term in general enjoyed high consideration among the Gnostics (see Acts of Thomas, pp. 10, 27, 44). Sinologist Anna Seidel refers to texts and even items produced by ancient Chinese sages as apocryphal and studied their uses during Six Dynasties China (A.D. 220 to 589). These artifacts were used as symbols legitimizing and guaranteeing the Emperor's Heavenly Mandate. Examples of these include talismans, charts, writs, tallies, and registers. The first examples were