A legendary is in Christian literature a collection of biographies of saints or other holy figures. The pre-eminent example of the form is the mid-thirteenth-century Legenda aurea or 'Golden Legend', which contained a large number of saints' lives, organised according to the liturgical year. The genre fell into decline following the Reformation.
The legenda (literally, that which is for reading) included facts which were historically genuine, as well as narrative which Christians now class as unhistorical legend. The term is a creation of the Middle Ages, and has its source in the reading of the prayers used in religious services. Since the days of the martyrs, the Catholic Church recalled to mind her famous dead in the prayers of the Mass and in the Office, by commemorating the names noted in the martyrologies and making mention of incidents in their lives and martyrdom. When the lectio became a matter of precept, the reading matter in the office for the day became in a precise sense legenda (that which must be read).
After the 13th century, the word legenda was regarded as the equivalent of vita (Life) and passio (suffering), and, in the 15th century, the liber lectionarius is comprised under what is known as "legend". Thus, historically considered, legend is the received story of the saints.
Gregory of Tours (d. 594) was acquainted with the apocryphal lives of the Apostles. At the beginning of the 7th century we already find related in Gaul (in the "Passio Tergeminorum" of Warnahar of Langres), as an incident in the local history of Langres, a story of martyrdom originating in Cappadocia.
The 7th century sees the literary form of legend domiciled in the West. Bede's "Martyrology" and Aldhelm of Malmesbury (d. 709) indicate a wide knowledge of this foreign literature. The legends of the "saviour" make their appearance in the Merovingian 7th century up to the middle of the 8th.
During the millenarian 10th century, the era of the Cluniacs and mysticism make the biographies of the saints subjective. The 12th century brings with the new religious orders the contemplative legends of Mary. The thirteenth sees the development of the cities and the citizens, hand in hand with which goes the popularization of the legend by means of collections compiled for the purposes of sermons, vit sanctorum, exempla, or merely to give entertainment (Vincent of Beauvais, Cæsarius of Heisterbach, James of Vitry, Thomas of Chantimpré, "Legenda Aurea"); in this century also arise the legends of Mary and, in connexion with the new feast of Corpus Christi (1264), a strong interest in tales of miracles relating to the Host.