Although Jews never used the dove as a symbol of peace, it acquired that meaning among early Christians, confirmed by St Augustine of Hippo in his book "On Christian Doctrine" and became well established. In Christian Iconography, a dove also symbolizes the Holy Spirit, in reference to Matthew 3:16 and Luke 3:22 where the Holy Spirit is compared to a dove at the Baptism of Jesus. The early Christians in Rome incorporated into their funerary art the image of a dove carrying an olive branch, often accompanied by the word "Peace". It seems that they derived this image from the simile in the Gospels, combining it with the symbol of the olive branch, which had been used to represent peace by the Greeks and Romans. The dove and olive branch also appeared in Christian images of Noah's ark. The fourth century Vulgate translated the Hebrew "alay zayit" (leaf of olive) in Genesis 8:11 as Latin "ramum olivae" (branch of olive). By the fifth century, Augustine of Hippo wrote in "On Christian Doctrine" that "perpetual peace is indicated by the olive branch ("oleae ramusculo") which the dove brought with it when it returned to the ark". In the earliest Christian art, the dove represented the peace of the soul rather than civil peace, but from the third century it began to appear in depictions of conflict in the Old Testament, such as Noah and the Ark, and in the Apocrypha, such as Daniel and the lions, the three young men in the furnace, and Susannah and the Elders. Before the Peace of Constantine (313 AD), in which Rome ceased its persecution of Christians following Constantine's conversion, Noah was normally shown in an attitude of prayer, a dove with an olive branch flying toward him or alighting on his outstretched hand. According to Graydon Snyder, "The Noah story afforded the early Christian community an opportunity to express piety and peace in a vessel that withstood the threatening environment" of Roman persecution. According to Ludwig Budde and Pierre Prigent, the dove referred to the descending of the Holy Spirit rather than the peace associated with Noah. After the Peace of Constantine, when persecution ceased, Noah appeared less frequently in Christian art. Medieval illuminated manuscripts, such as the Holkham Bible, showed the dove returning to Noah with a branch. Wycliffe's Bible, which translated the Vulgate into English in the 14th century, uses "a braunche of olyue tre with greene leeuys" ("a branch of olive tree with green leaves") in Gen. 8:11.