贵妃醉酒 in a nutshell:
Once upon a time, the emperor promised this consort Yang to meet somewhere. The consort was there on time, but the emperor didn't show up. Someone told her that the emperor had already gone to another consort's. So she got jealous, got herself drunk and made quite a scene, as naughty as a consort can be.
The consort was called Yang Guifei, the emperor Xuanzong of Tang.