Douglas Harper's Etymology Dictionary
abbreviation of Before Christ, in chronology, attested by 1823. The phrase itself, Before Christ, in dating, with exact years, is in use by 1660s.
Wikipedia
B.C. is a daily American comic strip created by cartoonist Johnny Hart. Set in prehistoric times, it features a group of cavemen and anthropomorphic animals from various geologic eras. B.C. made its newspaper debut on February 17, 1958, and was among the longest-running strips still written and drawn by its original creator when Hart died at his drawing board in Nineveh, New York, on April 7, 2007.
Now, the strip is produced by Hart's grandsons Mason Mastroianni (head writer and cartoonist) and Mick Mastroianni (writer for both B.C. and Hart's other creation, The Wizard of Id), and Hart's daughter Perri (letterer and colorist). The Mastroianni Brothers also created an original strip, The Dogs of C Kennel, in 2009. It is syndicated by Creators Syndicate.
Usage examples of "b.c.".
It was the principal city of Phoenicia in the second millennium b.c., and an important source of papyrus.
It was meant to be only a brotherly kiss, but when he drew back, he found that he was profoundly shaken.
It advanced inexorably, and he backed a step, trying to lead it away from Rayna.
Kirk, backtracking, ducked behind a large machine and pulled out his phaser.
Scowling, Kirk took a stubborn step after them, but Spock held him back.
You kept us togetherme, Raynabecause I could make her emotions come alive.
You'll never know the things love can drive a man tothe ecstasies, the miseries, the broken rules, the desperate chancesthe glorious failures, and the glorious victoriesbecause the word love isn't written in your book.