I don't actually think that's it but just maybe (it's been a really long time since I read it…) http://www.mangago.zone/read-manga/gerard_to_jacques/
Not sure .. Is this one?
http://www.mangago.zone/read-manga/ai_towa_yoru_ni_kizuku_mono/
http://www.mangago.zone/read-manga/yuuutsu_na_asa/
I dont know if it took place in the french revolution or not. Though i hope this the manga your looking for.
Merci beaucoup! I really appreciate the help (๑•ㅂ•)و✧
Je vous en prie! <-- I asked Google. Heh~ (⌒▽⌒)
It about a yaoi where it was during the French Revolution and this butler was helping out his master (who also became jealous of his deceased father knowing that the butler wished for a romantic relationship with him before) who had to runaway to his aunt's house during his exile because he was a noble. Him and his butler also made mad love when they were stuck in this big house during the winter with not much to eat or get warmth from. I hope someone has read this (and the butler is the seme btw)ヾ(☆▽☆)