Napoleon and Josephine
A marriage of convenience, at age 26 Napoleon took a fancy to Josephine. An older, prominent, and most importantly wealthy woman. As time drew on, Napoleon fell deeply in love with Josephine, and she with him, but that didn't deter the adultery on both sides-their mutual respect for one another kept them together, and their burning passion between them didn't falter, and was genuine. They eventually split, as Napoleon deeply required something Josephine could not give him, an heir. Sadly they parted ways, both bearing the love and passion in their hearts, for all eternity.