The type of large circular homestead occupied by a Manx Chieftan and his family in the 2nd Century CE, while the Romans were in Britain. The building was about 90 ft. in diameter, timber-framed, with a low dome-shaped roof of turf. The family occupied the inner portion around a central hearth, separated from the outer part where animals were stabled in winter.
(source: the model is at the Manx Museum; photograph is a postcard in my possession)