This caveman just calmly waited until he could finally get out of his slump in Common Era.
I didn't know that the screw wouldn't go in straight if you do it forcefully until Anno Domini.
Similar Fugu patterns can be seen on local earthenware made between 50 B.C. and 20 A.D.
The origin is after the narrative. What narrative was this? It's THE narrative, to many. This is the narrative of Jesus. This was so important that they decided to start a new era after it, making this era after death* or AD.
*Yes, I know it's not actually "After Death" but it's so commonly misconceived as such that I put it in there as the definition. You understand the meaning still, right? Anno Domini is also available as a definition too, so don't fret!
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.