Willie o Couglas Dale or Willie O Douglas Dale is Child ballad 101.
Willie goes to court, and he and a lady fall in love. When she is pregnant, they flee, but she goes in labor on the way, and gives birth to a son. They go on with the child and reach his father's lands.
This ballad contains elements from "Willie and the Earl Richard's Daughter" and to a lesser extent "Leesome Brand".