"The Dead Kings downloadable content picks up one week after Germain's death. Arno, still feeling devastated over Elise, finds refuge in Saint-Denis (at the time, known as Franciade). He is contacted by the Marquis de Sade at a tavern, who requests his help in finding the manuscript of Nicolas de Condorcet, hidden in the tomb of Louis IX beneath the city, in exchange for a ship that would take Arno to Egypt."
Source: Wikipedia, "[en.wikipedia.org/wiki/Assassin%27s_Creed_Unity%23Dead_Kings Assassin's Creed Unity]", available under the CC-BY-SA License.