St. Roch

Patron saint of dogs, dog trainers, and the falsely accused, because, you know, they are so frequently found together.

From Wiki:

According to his Acta and his vita in Legenda Aurea, he was born at Montpellier, at that time "upon the border of France" as Legenda Aurea has it,^[4] the son of the noble governor of that city. Even his birth was accounted a miracle, for his noble mother had been barren until she prayed to the Virgin Mary. Miraculously marked from birth with a red cross on his breast that grew as he did, he early began to manifest strict asceticism and great devoutness; on days when his "devout mother fasted twice in the week, and the blessed child Rocke abstained him twice also, when his mother fasted in the week, and would suck his mother but once that day".^[5] 

Hope that the plague was not a death sentence.

On the death of his parents in his twentieth year he distributed all his worldly goods among the poor like Francis of Assisi—though his father on his deathbed had ordained him governor of Montpellier—and set out as a mendicant pilgrim for Rome.^[6] Coming into Italy during an epidemic of plague, he was very diligent in tending the sick in the public hospitals at Acquapendente, Cesena, Rimini, Novara^[7] and Rome, and is said to have effected many miraculous cures by prayer and the sign of the cross and the touch of his hand. At Rome, according to Legenda Aurea he preserved the "cardinal of Angleria in Lombardy"^[8] by making the mark of the cross on his forehead, which miraculously remained. Ministering at Piacenza he himself finally fell ill. He was expelled from the town; and withdrew into the forest, where he made himself a hut of boughs and leaves, which was miraculously supplied with water by a spring that arose in the place; he would have perished had not a dog belonging to a nobleman named Gothard Palastrelli supplied him with bread and licked his wounds, healing them. Count Gothard, following his hunting dog that carried the bread, discovered Saint Roch and became his acolyte. 

On his return incognito to Montpellier he was arrested as a spy (by orders of his own uncle) and thrown into prison, where he languished five years and died on 16 August 1327, without revealing his name, to avoid worldly glory. (Evidence suggests, as mentioned earlier, that the previous events occurred, instead at Voghera in the 1370s.) After his death, according to Legenda Aurea, "anon an angel brought from heaven a table divinely written with letters of gold into the prison, which he laid under the head of S. Rocke. And in that table was written that God had granted to him his prayer, that is to wit, that who that calleth meekly to S. Rocke he shall not be hurt with any hurt of pestilence." 

The townspeople recognized him as well by his birthmark;^[9] he was soon canonized in the popular mind,^[10] and a great church erected in veneration. 

The date (1327) asserted by Francesco Diedo for Saint Roch's death would precede the traumatic advent of the Black Death in Europe (1347–49) after long centuries of absence, for which a rich iconography of the plague, its victims and its protective saints was soon developed, in which the iconography of Roche finds its historical place: previously the topos did not exist.^[11] In contrast, however, St. Roch of Montpellier cannot be dismissed based on dates of a specific plague event. In medieval times, the term "plague" was used to indicate a whole array of illnesses and epidemics. 

The first literary account is an undated Acta that is labeled, by comparison with the longer, elaborated accounts that were to follow, Acta Breviora, which relies almost entirely on standardized hagiographic topoi to celebrate and promote the cult of Roch.^[12] 

The story that when the Council of Constance was threatened with plague in 1414, public processions and prayers for the intercession of Roch were ordered, and the outbreak ceased, is provided by Francesco Diedo, the Venetian governor of Brescia, in his Vita Sancti Rochi, 1478. The cult of Roch gained momentum during the bubonic plague that passed through northern Italy in 1477-79.^[13]