Does anyone know when the first use of the single tear was? I was going to say La Passion de Jeanne d'Arc, but a quick Google corrected me in that Falconetti had a tears in both eyes.
Oh, it goes back further than that:
Offspring of Lugalbanda, Gilgamesh is strong to perfection
And when he cries it's from one eye, and one eye alone
That's right, you heard me, one eye, and one eye alone
The left one