A donor portrait or votive portrait is a portrait in a larger painting or other work showing the person who commissioned and paid for the image, or a member of his, or (much more rarely) her, family. Donor portrait usually refers to the portrait or portraits of donors alone, as a section of a larger work, whereas votive portrait may often refer to a whole work of art intended as an ex-voto, including for example a Madonna, especially if the donor is very prominent. The terms are not used very consistently by art historians, as Angela Marisol Roberts points out, and may also be used for smaller religious subjects that were probably made to be retained by the commissioner rather than donated to a church.
Donor portraits are very common in religious works of art, especially paintings, of the Middle Ages and Renaissance, the donor usually shown kneeling to one side, in the foreground of the image. Often, even late into the Renaissance, the donor portraits, especially when of a whole family, will be at a much smaller scale than the principal figures, in defiance of linear perspective. By the mid-15th century donors began to be shown integrated into the main scene, as bystanders and even participants.
The purpose of donor portraits was to memorialize the donor and his family, and especially to solicit prayers for them after their death. Gifts to the church of buildings, altarpieces, or large areas of stained glass were often accompanied by a bequest or condition that masses for the donor be said in perpetuity, and portraits of the persons concerned were thought to encourage prayers on their behalf during these, and at other times. Displaying portraits in a public place was also an expression of social status; donor portraits overlapped with tomb monuments in churches, the other main way of achieving these ends, although donor portraits had the advantage that the donor could see them displayed in his own lifetime.