The Nursing Madonna, Virgo Lactans, or Madonna Lactans, is an iconography of the Madonna and Child in which the Virgin Mary is shown breastfeeding the infant Jesus.
The depiction is mentioned by Pope Gregory the Great, and a mosaic depiction probably of the 12th century is on the facade of Santa Maria in Trastevere in Rome, though few other examples survive from before the late Middle Ages. It continued to be found in Orthodox icons (as Galaktotrophousa in Greek, Mlekopitatelnitsa in Russian), especially in Russia.
Usage of the depiction seems to have revived with the Cistercian Order in the 12th century, as part of the general upsurge in Marian theology and devotion. Milk was seen as "processed blood", and the milk of the Virgin to some extent paralleled the role of the Blood of Christ.
In the Middle Ages, the middle and upper classes usually contracted breastfeeding out to wetnurses, and the depiction of the Nursing Madonna was linked with the Madonna of Humility, a depiction that showed the Virgin in more ordinary clothes than the royal robes shown, for instance, in images of the Coronation of the Virgin, and often seated on the ground. The appearance of a large number of such depictions in Tuscany in the early 14th century was something of a visual revolution for the theology of the time, compared to the Queen of Heaven depictions; they were also popular in Iberia. After the Council of Trent in the mid-16th century, clerical writers discouraged nudity in religious subjects, and the use of the Madonna Lactans iconography began to fade away.