A portrait is a painting, photograph, sculpture, or other artistic representation of a person, in which the face and its expression is predominant. The intent is to display the likeness, personality, and even the mood of the person. For this reason, in photography a portrait is generally not a snapshot, but a composed image of a person in a still position. A portrait often shows a person looking directly at the painter or photographer, in order to most successfully engage the subject with the viewer.
Some of the earliest portraits of people who were not kings or emperors, are the funeral portraits that survived in the dry climate of Egypt's Fayum district. These are the only paintings of the Roman period that have survived, aside from frescos.
The art of the portrait flourished in Roman sculptures, where sitters demanded realistic portraits, even unflattering ones. During the 4th century, the portrait began to retreat in favor of an idealized symbol of what that person looked like. (Compare the portraits of Roman Emperors Constantine I and Theodosius I at their entries.) In Europe true portraits of the outward appearance of individuals re-emerged in the late Middle Ages, in Burgundy and France.
One of the best-known portraits in the Western world is Leonardo da Vinci's painting titled Mona Lisa, which is a painting of an unidentified woman. The world's oldest known portrait was found in 2006 by a local pensioner, Gérard Jourdy, in the Vilhonneur grotto near Angoulême and is thought to be 27,000 years old.
When the artist creates a portrait of him- or herself, it is called a self-portrait. Identifiable examples become numerous in the late Middle Ages, but if the definition is extended the first was by the Egyptian Pharaoh Akhenaten's sculptor Bak, who carved a representation of himself and his wife Taheri c. 1365 BC. However, it seems likely that self-portraits go back to the earliest representational art, and literature records several classical examples, now lost.
Since the dawn of photography, people have made portraits. The popularity of the daguerreotype in the middle of the 19th century was due in large part to the demand for inexpensive portraiture. Studios sprang up in cities around the world, some cranking out more than 500 plates a day. The style of these early works reflected the technical challenges associated with 30-second exposure times and the painterly aesthetic of the time. Subjects were generally seated against plain backgrounds and lit with the soft light of an overhead window and whatever else could be reflected with mirrors.
As photographic techniques developed, an intrepid group of photographers took their talents out of the studio and onto battlefields, across oceans and into remote wilderness. William Shew's Daguerreotype Saloon, Roger Fenton's Photographic Van and Mathew Brady's What-is-it? wagon set the standards for making portraits and other photographs in the field.