A notable Great House to be headed by a Baron was House Harkonnen.
Behind the Scenes Edit
Typically, a Baron would rank the lowest in most known peerage systems. In the case of House Harkonnen, this would make sense, as their limited history in the original Dune novel provided by Frank Herbert indicates that the Harkonnens were banished for cowardice after the Battle of Corrin, and that they plied back Great House status through adroit manipulation of the whale fur trade. Therefore, the Harkonnen barony was appears to have been granted due to their sheer amassment of wealth.