Aeschylus 
Agamemnon [EPUB ebook] 

A watchman on top of the house, reporting that he has been lying restless there like a dog for a year, for so rules the expectant manly-willed heart of a woman (that woman being Clytemnestra awaiting the return of her husband, who has arranged that mountaintop beacons give the signal when Troy has fallen). He laments the fortunes of the house, but promises to keep silent: ‘A huge ox has stepped onto my tongue.’ However, when Agamemnon returns, he brings with him Cassandra, the enslaved daughter of the Trojan king, Priam, and a priestess of Apollo, as his concubine, further angering Clytemnestra.