Plattenville's history dating back to at least 1781 when Spanish Governor Galvez communicated to the Spanish Government that he had settled folks there (Canary Islanders) [3]. Acadians arrived as well; many arrived circa 1785. A nearby Spanish Militia outpost at Belle Alliance existed but no Church was built as was planned. Church would be built at Plattenville instead—parish known as "The Assumption of the Blessed Virgin Mary" with church erected in April 1793 by Spanish colonial officials and Fr. Bernardo De Deva, a Capuchin Friar. The residents petitioned for the church due to long distance to Donaldsonville. The first visit of a bishop was on May 25, 1796—Penalver y Cardenas (First Bishop of Louisiana). A school was located here in 1825 and operated by the Convent of the Sisters of Loreto at the Foot of the Cross. The Sisters of Mt. Carmel (teachers) resided here beginning in 1833 and took over the school. The first and only complete seminary of the Diocese of New Orleans was also built here (a 2-story brick building) in 1838; it built here due to yellow fever outbreaks in New Orleans and for Plattenville's beauty.
