At the time, the
Barbary states held many Christian slaves. Some converted to Islam, but others held onto their religion. A treaty was concluded by France with the
Ottoman Porte that allowed the French to send a priest with their consuls. In November 1645 the priest Louis Guérin was sent to Tunis, and began providing spiritual comfort to the slaves.
Vincent de Paul sent Le Vacher to
Tunis in November 1647 to assist Guérin. He arrived during an epidemic of the plague. He did much to comfort people of all classes, including slaves, merchants and
Turks, who held him in great esteem. He fell sick himself and was expected to die, but recovered. In July 1648 the
consul, L'Ange de Martin, became seriously ill. He sent for Le Vacher and asked him to take his place if he should die. Le Vacher refused, and the consul proposed to nominate one of the French merchants. However, they could not agree on a candidate. When the
Bey was told of the problem, he also said that Le Vacher should become consul, and on the death of Martin he accepted this position. He was consul for five years while also acting as a missionary. Exhausted, Le Vacher won permission in 1653 to be relieved of his duties as consul and devoted himself solely to missionary work first in Tunis and then in
Bizerte. He returned to Tunis, where he was again made consul, and where the
Holy See named him
Vicar Apostolic. Le Vacher was consul from 1648 until 1667, when he was succeeded by Jean Ambrozin. ==Algiers==