From the Peterborough Chronicle 1127 :
Many men both saw and heard a great number of huntsmen hunting. The huntsmen were black, huge, and hideous, and rode on black horses and on black he-goats, and their hounds were jet black, with eyes like saucers, and horrible. This was seen in the very deer park of the town of Peterborough, and in all the woods that stretch from that same town to Stamford, and in the night the monks heard them sounding and winding their horns.
This reminds me of the Gallowglas.
The merciless Macdonwald,
Worthy to be a rebel, for to that
The multiplying villainies of nature
Do swarm upon him, from the Western isles
Of kerns and gallowglasses is supplied