‘Track’
Ol
Son of Olwydd and one of the seldom-mentioned members of the party formed to help Culhwch. Ol was chosen because he was an superb tracker with the ability to pick up any trail, even one that was as much as seven years older than he was although no indication is given of his age.
As an adult he tracked down a herd of pigs stolen from his father seven months before his birth.
Source
Culhwch and Olwen | Late 11th century