Of a similar type to Jack of the Syde was the man remembered by the little town of Rothbury. This man was a notorious local moss-trooper by the name of Selby. He is generally held to have been a particularly bloodthirsty and vicious example of the type. His bravery and cunning were legendary, but cannot have made up for his many dreadful crimes. He lived in a cave, still called Selby’s Cove, high on the slopes of the Simonside Hills south of the town. Unfortunately, other than his name, hideout and reputation virtually nothing is known of the man. When he lived, how he died and even his full name are entirely mysterious.
from MYSTERIOUS NORTHUMBERLAND by Rupert Matthews