We do use a lot of latin "sayings" in French it's like a part of our language.
(when you use i.e. you know it means "id est", "that's to say" or something like that (sorry for my english)). We use "mea culpa" or "alea jacta est" as if they were french words, sorry ;-)
For 79 and ashes I was thinking about pompéi when people got "ashes on their head" and when religious people were saying it was inhinabitants fault displeasing their gods.
(the "culpa" part ;-) )