1732 & 1746: Repairs to organ at :fr:Collégiale Saint-Gervais-Saint-Protais de Gisors|Saint-Gervais-Saint-Protais Collegiate Church of Gisors
Jean-Baptiste Nicolas Lefebvre (1705-1784)
JBNL was son of Charles Lefebvre, was one of the most famous European organ makers of the 18th century, building giant organs with five keyboards.
1731-1733: restored the 1661 organ at :fr:Église Saint-Éloi de Rouen|Saint-Éloi Church along with Charles Lefebvre
1737-1747: BrothersJean-Baptiste Nicolas Lefebvre and Louis Lefebvre along with their cousin Clement Lefebvre are commissioned to build a new organ at Abbey of Saint-Étienne, Caen
1739-1740: An important restoration to the gothic Antoine Josseline and Gilbert Cocquerel organ of :fr:Église Notre-Dame de Caudebec-en-Caux|Église Notre-Dame Caudebec-en-Caux by brothers Jean-Baptiste and Louis Lefebvre.
1740: worked on :fr:Église Saint-Éloi de Rouen|Saint-Éloi Church
1741: the Saint-Ouen Abbey Church organ was dismantled "in order to obviate damage and considerable loss that could be incurred to their organ by the presence of wheat and other grains in their church..." The date of reassembly is unknown.
1769-1774: More restoration work on organ at :fr:Collégiale Saint-Gervais-Saint-Protais de Gisors|Saint-Gervais-Saint-Protais Collegiate Church of Gisors
1774: worked on :fr:Église Saint-Éloi de Rouen|Saint-Éloi Church
1779: Complete restoration of organ at Le Havre Cathedral
1780-1784: Restoration work by JBNL on tribune organ at Montivilliers Abbey
Louis Lefebvre (1708-1754)
Louis-Charles Lefebvre was son of Charles Lefebvre.
1737-1747: Brothers Jean-Baptiste Nicolas Lefebvre and Louis Lefebvre along with their cousin Clement Lefebvre are commissioned to build a new organ at Abbey of Saint-Étienne, Caen
1739-1740: An important restoration to the gothic Antoine Josseline and Gilbert Cocquerel organ of :fr:Église Notre-Dame de Caudebec-en-Caux|Église Notre-Dame Caudebec-en-Caux by brothers Jean-Baptiste and Louis Lefebvre.
1746: Construction of a new 30-stop organ in the sepulcher of Montivilliers Abbey by brothers Jean-Baptiste Nicolas Lefebvre and Louis Lefebvre.
Genealogy of the family
The following is the known genealogy of the family. Hector Lefebvre x Jacqueline Rabette │ └──> Nicolas Lefebvre x Ysabeau Morin │ └──> Madeleine │ └──> Clément I x Anne Leloup │ └──> Nicolas └──> Germain │ └──> Clément II (21 August 1658 - 23 January 1697
