But the symbolism of the olive, founded upon its healing qualities and its oil’s well-known property of calming roughened water, was not only Grecian: it was wide-spread, and the Romans used it politically as well as religiously. Their heralds carried olive on an embassy of peace, and the custom lingered in Italy through the Middle Ages; Dante describing how the multitude ‘Flock round the herald sent with olive branch.’

In Christian art the olive also invariably represents peace or reconciliation, and it is first found in the Catacombs, where there is a curious painting of the mystic fish which swims towards the Cross with a sprig of olive in its mouth. The fish, by the well-known anagram, represents Christ, who, through the Cross, brings peace on earth.

A dove with an olive twig in its beak is also found upon early Christian tombs. And then, as Tertullian says, ‘it is a symbol of peace even older than Christianity itself’[114]—the herald of the peace of God from the very beginning. Sometimes the word itself, ‘Pax,’[115] is added, thereby marking the sense beyond all possibility of dispute; viz., that it is meant to assert of the soul of the deceased that it has departed in the peace of God and of his Church.[116]

Tertullian refers, of course, to the dove sent forth by Noah which returned across the waters, and ‘Lo! in her mouth was an olive leaf plucked off,’ sign that the wrath of God was appeased. The dove, bearing the twig of olive, executed in coloured marbles, occurs repeatedly in the decoration of Saint Peter’s. Here the dove represents the Church bearing the Gospel message of peace to the world. The same emblem is found in the decoration of St John Lateran, and Pope Innocent X. incorporated it with his coat of arms.

The olive naturally appears as an attribute in allegorical figures of Peace. One of the earliest and most famous of these figures is in Ambrogio Lorenzetti’s great fresco entitled ‘Good Government.’[117] The golden-haired Peace, who wears a white robe, is crowned with olive, and carries an olive branch in her hand. She has a beauty of her own, but compared with the more virile figures in the composition, Fortitude, Prudence, Temperance and Justice, she is a little heavy and inert, a little wanting in interest, as the citizens perhaps would have found their daily life were they condemned to days of peace.

In small, fierce Siena the olive was a very favourite symbol and found more frequently than any other. One of the most curious characteristics of religious art is the inexactitude with which it reflects a people’s mood, for the ideal upon the wall above the altar is often just precisely that to which they do not strive. When the Medici were in power and Florentine social life was at its worldliest, simplicity and purity, almost austerity, were demanded of the artist, and the lily was the favourite symbol. Murillo painted Madonnas to the Church’s order, sweet and forgiving, kind to indulgence, almost voluptuous, at a moment when not only the devotions of Jews and heretics but the private life of every citizen of Seville was under stern control. And in Seville, with inquisitorial fires blazing, the Virgin had as attribute the rose of love and charity. So the turbulent Sienese, who, when no enemy knocked at the gates, fought with one another, loved a still and peaceful art. It was conservative, for they cared for no novelty, no variety of subject, pose or action. And their favourite symbol was the olive branch of peace. The angel Gabriel almost invariably carries olive,[118] Saint John the Evangelist[119] and Saint Ansano,[120] their own saint, both hold branches of it, and it crowns the blonde curls of many a little angel.

In representations of the first and third persons of the Holy Trinity the olive branch is very rare. Upon some ancient crucifixes, however, where a hand holding a wreath represents the Eternal Father, the wreath, though usually of laurel, in some instances is formed of olive. In the Crucifix of the tenth century, known as the Crucifix of Lothair,[121] the wreath is distinctly of olive, but since it encircles the Holy Dove the olive is perhaps equally the attribute of the Holy Ghost. In the Crucifix upon the Manual of Prayer of Charles the Bald,[122] the wreath is of laurel and there is no dove.

Mabillon speaks of a group of the Trinity in human form, sculptured by order of Abelard at the Paraclete. In it the Father wore a closed crown, the Son a crown of thorns, and the Holy Ghost a crown of olive. The group has long since disappeared, and there seems no other instance of the Holy Ghost in human form being represented with the olive. A dove bearing an olive twig could not be an emblem of the Holy Ghost unless the bird’s head were encircled with a halo.

But Christian art uses the ancient symbol of peace repeatedly when illustrating Christ’s life upon earth. First we find the angel Gabriel bringing to the Virgin a branch of olive as token that his message is of peace. Sometimes he is also crowned with olive. He comes crowned with peace, and the branch in his hand foreshadows the reconciliation between God and man which is to come by the Child whose advent he announces.

The olive branch took precedence of the lily as the symbol carried by the announcing angel. Originated probably by Simone Martini, one of its earliest instances is in his Annunciation now in the Uffizi. In the Florentine school the simple stick carried by the herald angel evolved, as we have seen, through the fleur-de-lys to the stem of lilies. In Siena it was the meaning of the wand, rather than the wand itself, which was developed. The wand simply marked that Gabriel was a herald; that it was a message of peace and goodwill which he brought was shown by the grey-green leaves of the olive. As a symbol it was by no means of Simone Martini’s own finding, for it was a very usual political symbol of the day, but he seems to have been the first to have placed it in the angel Gabriel’s hand, and the school of painting in Siena whole-heartedly and faithfully adopted his device. The general trend of Sienese symbolism was to direct devotion to the incarnate Godhead rather than to Mary of Nazareth, and it is of Him, as the bringer of peace on earth, that the branch of olive tells, as elsewhere the white lily proclaims the virginity of the coming motherhood.