Angels have appeared in works of art since early Christian art, and they have been a popular subject for Byzantine and European paintings and sculpture.
Normally given wings in art, angels are usually intended, in both Christian and Islamic art, to be beautiful, though several depictions go for more awe-inspiring or frightening attributes, notably in the depiction of the living creatures (which have bestial characteristics), ophanim (which are wheels) and cherubim (which have mosaic features); As a matter of theology, they are spiritual beings who do not eat or excrete and are genderless. Many historical depictions of angels may appear to the modern eye to be gendered as either male or female by their dress or actions, but until the 19th century, even the most female looking will normally lack breasts, and the figures should normally be considered as genderless. In 19th-century art, especially funerary art, this traditional convention is sometimes abandoned.
Christian art
In the Early Church
Specific ideas regarding how to portray angels began to develop in the early Church. Since angels are defined as pure spirits, the lack of a defined form has allowed artists wide latitude for creativity. Daniel 8:15 describes Gabriel as appearing in the "likeness of man" and in Daniel 9:21 he is referred to as "the man Gabriel." Such anthropomorphic descriptions of an angel are consistent with previous descriptions of angels, as in Genesis 19:5. They were usually depicted in the form of young men.
The earliest known Christian image of an angel, in the Cubicolo dell'Annunziazione in the Catacomb of Priscilla, which is dated to the middle of the third century, is a depiction of the Annunciation in which Gabriel is portrayed without wings. Representations of angels on sarcophagi and on objects such as lamps and reliquaries of that period also show them without wings, as for example the angel in the Sacrifice of Isaac scene in the Sarcophagus of Junius Bassus.
In a third-century fresco of the Hebrew children in the furnace, in the cemetery of St. Priscilla, a dove takes the place of the angel, while a fourth-century representation of the same subject, in the coemeterium majus, substitutes the Hand of God for the heavenly messenger.
The earliest known representation of angels with wings is on what is called the Prince's Sarcophagus, discovered at Sarigüzel, near Istanbul, in the 1930s, and attributed to the time of Theodosius I (379-395). Flying winged angels, very often in pairs flanking a central figure or subject, are derivations in visual terms from pairs of winged Victories in classical art.
In this same period, Saint John Chrysostom explained the significance of angels' wings: "They manifest a nature's sublimity. That is why Gabriel is represented with wings. Not that angels have wings, but that you may know that they leave the heights and the most elevated dwelling to approach human nature. Accordingly, the wings attributed to these powers have no other meaning than to indicate the sublimity of their nature."
From then on Christian art generally represented angels with wings, as in the cycle of mosaics in the Basilica di Santa Maria Maggiore (432–440). Multi-winged angels, often with only their face and wings showing, drawn from the higher grades of angels, especially cherubim and seraphim, are derived from Persian art, and are usually shown only in heavenly contexts, as opposed to performing tasks on Earth. They often appear in the pendentives of domes or semi-domes of churches.
Byzantine art
Angels appear in Byzantine art in mosaics and icons. Artists found some of their inspiration from winged Greek figures such as "Victory". They also drew from imperial iconography. Court eunuchs could rise to positions of authority in the Empire. They performed ceremonial functions and served as trusted messengers. Amelia R. Brown points out that legislation under Justinian indicates that many of them came from the Caucasus, having light eyes, hair, and skin, as well as the "comely features and fine bodies" desired by slave traders. Those "castrated in childhood developed a distinctive skeletal structure, lacked full masculine musculature, body hair and beards,...." As officials, they would wear a white tunic decorated with gold. Brown suggests that "Byzantine artists drew, consciously or not, on this iconography of the court eunuch".