公元前

gǔ luó mǎ yòng de yīn lì yú gōng yuán qián bèi rú lüè lì qǔ dài

古罗马用的阴历，于公元前被儒略历取代。

The lunar calender in use in ancient Rome but replaced by the Julian calendar before Christ.

tā sǐ yú gōng yuán qián sān shí nián

他死于公元前三十年。

He died in 30 B.C.