[2] Labande was appointed as the archivist of the Prince's Palace of Monaco on 1 April 1906, replacing Gustave Saige.
[2] He assisted Louis II, Prince of Monaco in refurbishing the palace, retrieving old paintings, carpets and faience acquired by Honoré II, Prince of Monaco and lost during the French Revolution and First French Empire.
[3] Moreover, following the prince's wishes to turn Monaco into a cultural center, he organised conferences about the arts annually.
[2] Labande authored many books about prominent families from Provence, the city of Avignon, and the principality of Monaco.
[2] Labande was appointed as a member of the Académie des Inscriptions et Belles-Lettres in 1927, replacing Henry Cochin.