The Blackwoods are an old house in the riverlands, descended of the First Men, and are perhaps the only remaining great house of riverlords which follows the old gods. The Blackwoods have been feuding with the Brackens for nearly a hundred years after Lord Quentyn Blackwood was killed during a melee by Ser Otho Bracken, called the Brute of Bracken. Tytos Blackwood is the lord of the house.
Lord Tytos has a son, Lucas, but whether he is his heir and has any siblings remains a question.
Tytos Blackwood led a charge from Riverrun when Robb Stark’s host came down on the besieging Lannisters. Raventree Hall’s lands were stripped of every pig, cow, and speck of grain by the Lannisters, to leave them a scorched desert when Lord Tytos won it back. His son, Lucas, was among the highborn men who went with Catelyn Stark to the Reach to negotiate an alliance between King Robb and King Renly. He returned with her to Riverrun, joining his father at one of the fords of the Red Fork which the Blackwoods were guarding.
Lucas Blackwood was among those slain at the Red Wedding. Lord Tytos remains one of the few riverlords fighting against the Lannisters following the death of King Robb and the imprisonment of Lord Edmure Tully, as much for honor’s sake as for the fact that the Brackens have taken the part of the Lannisters.