[Esther Ruth]

I wasn't sure which it was, "Common" or "Christian". Looked it up after I posted that answer and realized many places like wikipedia say both. And were I came up in my mind with AC instead of AD I don't know. I guess BC (before Christ) and AC for (after Christ) instead of the correct latin AD.

[James Ewell Brown Stuart]

Makes perfect since. As on older student who went back to University, I accidentally said A.D. in a paper and was told that the correct term was CE - Common Era. Well, I happen to like B.C. and A.D., so I use them anyway.