The Broadbeams were a tribe of Dwarves who came from the Blue Mountains. They were paired with the Firebeards, but each tribe had its own mansion. Tolkien, however, never specified if the Broadbeams lived in Nogrod or Belegost. At the start of the War of the Dwarves and Orcs, the houses of the other Fathers of the Dwarves were called upon by Durin's Folk. It is probable that Broadbeams were one of the houses summoned.
The People of Middle-earth