Its dynastic period ended with defeat at Bosworth Field and the death of Richard III.  
This house, founded by Edmund of Langley, had its first claimant to the throne with a figure descended from Lionel, Duke of Clarence, through the female side - a claim criticized by Chief Justice John Fortescue.  The middle of its three kings ruled for two and a half months, while the first king had consolidated power after victory at Towton.  Its dynastic period ended with defeat at Bosworth Field and the death of Richard III.  FTP, name this royal house succeeded by the Tudors and which famously warred with the Lancastrians.
This house, founded by Edmund of Langley, had its first claimant to the throne with a figure descended from Lionel, Duke of Clarence, through the female side - a claim criticized by Chief Justice John Fortescue.  
House of York