Convict with the Chapel of Pope Leo the Great

In 1828, the Prussian authorities issued a decree for the dissolution of the Franciscan Monastery. Despite the decision being suspended for several years, it was eventually implemented in 1835. In 1857, the Franciscans briefly returned to Wejherowo, but in 1872, they were relocated to a new building. The initiator of the construction of the new monastery, funded by the contributions of the faithful, was the parish priest of St. Trinity Parish, Father Albert Rook. However, the Franciscans did not stay there for long. In 1875, they finally had to leave the monastery and Wejherowo, after 228 years of presence in the city. It is worth noting that the Franciscans returned to Wejherowo on October 4, 1946.

After the Franciscans left the building, it became the property of the Bishop of Chełmno. Over time, a chapel was added to the existing building, and in 1903, a boarding school for students of the Wejherowo gymnasium was established there, named "Collegium Leoninum" in honor of Pope Leo XIII and Bishop Leon Redner. The chapel was also dedicated to St. Leo the Great. Therefore, boys who planned to enter the priesthood in the future lived in the boarding school. They received accommodation, meals, and appropriate education there.

During the occupation, the building served as a warehouse, and its residential areas were converted into offices for supplying the population. Since 1945, a contagious diseases hospital for former prisoners of the Stutthof camp has been operating in the building.

In 1947, Father Władysław Mówka reactivated the Collegium. In 1950, a Minor Seminary was established there, but it was dissolved in 1957. In the same year, a new parish under the patronage of St. Leo the Great was established. The former boarding school building was designated as the residence of the parish and still serves this purpose to this day.