came to be seen as the "home of the Blessed Sacrament" where it would be adored. A common early practice of adoration known as Quarantore (literary forty hours) started in the 16th century. It is an exercise of devotion in which continuous prayer is made for forty hours before the exposed Blessed Sacrament. This practice started in Milan in the 1530s and 1540s by Capuchins such as Giuseppe da Fermo who promoted long periods of adoration. From Northern Italy it was carried to elsewhere in Europe by the Capuchins and Jesuits. The practice of the perpetual adoration of the Blessed Sacrament started in Naples in 1590 within the Order of the Clerics Regular Minor, founded by St. Francis Caracciolo, Fr. Augustine Adorno and Fr. Fabrizio Caracciolo. This practice was modified to continuous adoration during the day due to the few number of religious in the Order's Constitutions of 1597 with approval by Pope Clement VIII At a later date, the Order would revert to its earlier rule of perpetual adoration, but only within houses of no less than twenty religious. The houses with less religious were offered perpetual adoration as an option if it would not interfere with the execution of the house's ministries. In the 18th century, large numbers of people were drawn to quiet adoration of the Eucharist and priests such as Alphonsus Liguori encouraged the practice. He wrote a book on Visits to the Blessed Sacrament and he explained that a visit to the Blessed Sacrament is the "practice of loving Jesus Christ", since friends who love each other visit regularly. Benedict Joseph Labre, a homeless beggar and Franciscan tertiary, was a familiar figure in the city of Rome and known as the "saint of the Forty Hours" (or Quarant' Ore) for his dedication to Eucharistic adoration. 19th and 20th centuries The French Revolution hindered the practice of Eucharistic adoration, however, the beginning of the 19th century witnessed a strong emphasis on Eucharistic piety, devotions and adorations. By 1829, the efforts of the Confraternity of Penitents-Gris brought Eucharistic adoration back in France. Twenty years later, the Venerable Leo Dupont initiated the nightly adoration of the Blessed Sacrament in Tours in 1849, from where it spread within France. Saint Anthony Mary Claret, the confessor to Isabella II of Spain and the founder of the Claretians, was also a fervent promoter of Eucharistic devotion and adoration and introduced the