Mohr was born in
Salzburg on 11 December 1792, to an unmarried embroiderer, Anna Schoiberin, and Franz Mohr, a
mercenary soldier and deserter, who abandoned Joseph's mother before the birth. The ancestors on his father's side came from the town of
Mariapfarr in the mountainous
Lungau region south of Salzburg, while his mother's family was from the salt-mining city of
Hallein. At his
baptism shortly after birth, the godfather was recorded as Joseph Wohlmuth, the last official executioner of Salzburg, who did not personally attend but had himself represented by one Franziska Zachin. As the parents were unmarried, Joseph received the name of his godfather, according to custom. Johann Nepomuk Hiernle, vicar and leader of music at
Salzburg Cathedral, enabled Mohr to have an education and encouraged him in music. As a boy, Mohr would serve simultaneously as a singer and violinist in the choirs of the University Church and at the
Benedictine monastery church of St. Peter. From 1808 to 1810, Mohr studied at the
Benedictine monastery of Kremsmünster in the province of Upper Austria. He then returned to Salzburg to attend the Lyceum school, and in 1811, he entered the
seminary. Since he was of illegitimate birth, a special dispensation by the pope was required in those days for him to attend seminary. On 21 August 1815, Mohr graduated and was ordained as a priest. ==Father Mohr==