Born 2 June, 1835, at Riese, Province of Treviso, in Venice. His parents were Giovanni Battista Sarto and Margarita (née Sanson); the former, a postman, died in 1852, but Margarita lived to see her son a cardinal. After finishing his elements, Giuseppe at first received private lessons in Latin from the arch-priest of his town, Don Tito Fusaroni, after which he studied for four years at the gymnasium of Castelfranco Veneto, walking to and fro every day. In 1850 he received the tonsure from the Bishop of Treviso, and was given a scholarship of the Diocese of Treviso in the seminary of Padua, where he finished his classical, philosophical, and theological studies with distinction. He was ordained in 1858, and for nine years was chaplain at Tombolo, having to assume most of the functions of parish priest, as the pastor was old and an invalid. He sought to prefect his knowledge of theology by assiduously studying Saint Thomas and canon law; at the same time he established a night school for adult students, and devoted himself of the ministry of preaching in other towns to which he was called. In 1867 he was named arch-priest of Salzano, a large borough of the Diocese of Treviso, where he restored the church, and provided for the enlargement and maintenance of the hospital by his own means, consistently with his habitual generosity to the poor; he especially distinguished himself by his abnegation during the cholera. He showed great solicitude for the religious instruction of adults. In 1875 he was made a canon of the cathedral of Treviso, and filled several offices, among them those of spiritual director and rector of the seminary, examiner of the clergy, and vicar-general; moreover, he made it possible for the students of the public schools to receive religious instruction. In 1878, on the death of Bishop Zanelli, he was elected vicar-capitular. On 10 November, 1884, he was named Bishop of Mantua, then a very troublesome see, and consecrated on 20 November. His chief care in his new position was for the formation of the clergy at the seminary, where, for several years, he himself taught dogmatic theology, and for another year moral theology. He wished the doctrine and method of St. Thomas to be followed, and to many of the poorer students he gave copies of the "Summa theologica"; at the same time he cultivated the Gregorian Chant in company with the seminarians. The temporal administration of his see imposed great sacrifices upon him. In 1887 he held a diocesan synod. By his attendance at the confessional, he gave the example of pastoral zeal. The Catholic organization of Italy, then known as the "Opera dei Congressi", found in him a zealous propagandist from the time of his ministry at Salzano.

We must not forget his generous charity in public misfortunes: during the great earthquakes of Calabria, he asked for the assistance of Catholics throughout the world, with the result that they contributed, at the time of the last earthquake, nearly 7,000,000 francs, which served to supply the wants of those in need, and to build churches, schools, etc. His charity was proportionately no less on the occasion of the eruption of Vesuvius, and of other disasters outside of Italy (Portugal and Ireland). In few years Pius X has secured great, practical, and lasting results in the interest of Catholic doctrine and discipline, and that in the face of great difficulties of all kinds. Even non-Catholics recognize his apostolic spirit, his strength of character, the precision of his decisions, and his pursuit of a clear and explicit programme.