It was originally established as "The Mission of Our Lady of the Assumption among the Hurons in
Detroit" in 1728 by the
Jesuit missionary
Fr. Armand De La Richardie, S.J. In 1765, a church was erected for the
Hurons and some sixty French settler families. Assumption became an official,
canonical institution in 1767 under its first pastor, Fr.
Pierre Potier S.J. who remained at his post until his death in 1781. That year, the
bishop of
Quebec sent his
Vicar-General, Fr. Francois-Xavier Hubert to be
pastor of Assumption parish. Fr. Hubert initiated plans to build a rectory and a school. A shortage of land for this project was rectified by a donation of land from the
Hurons on March 6, 1782. The rectory was built in 1785 and in 1786 as coadjutor to the
bishop of Quebec, Fr. Hubert, who had since relocated for his new post, contributed to the building of a new church and sent two women from Quebec to establish a school. The new church opened in 1787 under Fr. François-Xavier Dufaux, who had replaced the interim pastor, Fr. Pierre Fréchette in 1786. In 1796, Fr. Jean-Baptiste Marchand began his thirty-year pastorate of Assumption parish. Upon Fr. Marchand's death in 1825, his assistant, Fr. Joseph Crevier, succeeded him. Fr. Crevier was pastor until 1831 when he was replaced by
Fr. Angus Macdonell. On July 7, 1842, the
cornerstone of the present church was laid. Three years later, on July 20, 1845, the new rectangular church was inaugurated under Fr. Pierre Point S.J. This rectangular structure forms the nave of the present parish. In 1857,
Assumption College was opened, and two years later, in 1859, the bishop of the
London Diocese, the Most Reverend Pierre Adolphe Pinsonneault, transferred his
see to
Sandwich and made Assumption church his
cathedral. On November 10, 1867, following a year-long interregnum, the Most Reverend John Walsh became bishop. In 1869, he returned the
see to London, leaving Assumption in the care of Fr. Pierre Dominic Laurent. In 1870, the
Basilian Fathers of Toronto took control of Assumption parish and college under their first superior, Fr. Dennis O’Connor, and parish priest Fr. Jean Joseph Marie Abouli. Four years later, in 1874, Fr. O’Connor oversaw the addition of the tower and
sanctuary of the present church. In 1893, Fr. François-Xavier Semande, an alumnus of Assumption College, became the pastor and installed a new tower bell. In 1896, a new, brick
rectory was built and in 1902 both it, and the church, were wired for electricity. In 1907, Fr. Alfred J. Côté became pastor. During his tenure, rosary chapel and the
sacristy, begun under Fr. Semande, were completed. ==20th century to present==