Enjolras/Grantaire is the one I always come back to, but more for the friction and tension between them; it's tough to sell me on any fic that has those two in a functional relationship. Not impossible, but damn, it's hard enough to capture their dynamic already without trying to develop it into something stable or healthy.
I guess it doesn't really count as a one
true pairing though, because I also ship Enjolras/Combeferre like burning.
Also, Jean Prouvaire totally had a torrid affair with George Sand
and nothing will ever convince me otherwise.
[Dieu] entend ta voix, ô fille des hommes! aussi bien que celle des constellations; car rien n'est petit pour celui devant lequel rien n'est grand.
- George Sand, Les sept cordes de la lyre