Domenico Ghirlandaio's Last Supper in the refectory of the Ognissanti monastery, Florence (1480), is the most important of his three treatments of this subject and the direct compositional ancestor of Leonardo's definitive version in Milan fifteen years later. Understanding Ghirlandaio's fresco helps illuminate what Leonardo inherited - and what he transformed.
The subject is Matthew 26:20-29, John 13:21-30: the final meal Jesus shared with his twelve disciples before his arrest, in which he identified his betrayer and instituted the Eucharist. For monastic refectories - dining rooms where monks ate their meals in silence while a reader recited Scripture - the Last Supper was the natural subject: the community's daily eating was understood as a participation in the meal at which the Eucharist was founded, a re-enactment of John 6:35 ('I am the bread of life') in the physical act of communal nourishment.
Ghirlandaio's composition establishes the conventions that would become standard: a long table extending horizontally across the picture plane, Christ at the center, the disciples ranged on either side. Most significantly, Judas sits on the near side of the table, isolated from the other disciples - a compositional device that identifies the betrayer visually before the narrative has done so. This placement of Judas in front of the table, facing the viewer, makes him simultaneously more prominent and more excluded: closer to us in space, infinitely farther from Christ in spirit.
Behind the table, through an open loggia, Ghirlandaio painted a garden landscape - cypresses, orange trees, a blue sky with birds - that creates a spatial relief behind the scene and introduces natural light into what might otherwise be a claustrophobic interior. This device Leonardo would use more dramatically, opening three windows behind the disciples in his Milan version to flood the scene with the light that Christ's presence brings.
The fresco's function as refectory decoration meant that the monks who ate daily before it were placed, imaginatively and ritually, in the position of the disciples. Their table extended the table in the painting; their meal participated in the meal the painting depicted. The theological program was not separable from its physical context: here, in this room, with this food, you are present at the founding meal of your faith.
Ghirlandaio's young apprentice Michelangelo was present in the workshop during this period, absorbing the compositional thinking that would eventually be redirected toward the Sistine ceiling. The connections between Florentine Early Renaissance figure organization and the monumental achievement of High Renaissance Rome run directly through Ghirlandaio's workshop. This Last Supper, which most visitors pass without stopping because Leonardo's version looms so large, is where the tradition that produced Leonardo's masterpiece was formed.