House Blackwood of Raventree Hall is a House in the Riverlands. Their Seat is Raventree Hall. An old castle built atop ancient cairns with a huge, dead Weirwood in the centre of the castle which plays host to hundreds of ravens, from which the castle gains it's name. Many Blackwoods ascribe to the theory that the Brackens poisoned their Weirwood after one Blackwood killed off their entire breed of prized warhorses.
House Blackwood are descended from the First men in the Age of Heroes and were Kings in the Wolfswood before being exiled south by Houses Glover and Forrester. They have had a long standing fued with House Bracken, who occupy Stone Hedge across the Red Fork. The feud has been agitated and fixed multiple times with marriages and curses between the two houses with House Justman famously descended from the bastard coupling of a Bracken and a Blackwood.
Brynden II Blackwood:
War of the Ninepenny Kings: