Body: Black mohair
Hackle: Black
Wing: Water-hen wing, or woodcock
The Black Ant from The Art of Angling by William Blacker. The one above is tied in hand on a vintage blind-eye hook, while the three below all are tied for fishing on Ahrex FW580 #10.
Another easy and simple pattern that have stood its time since the days of Blacker: A black and fly, fished wet.