Gemót-ærn

According to the Old English Dictionary:

-ern, es;

gemót-ærn

n. [gemót; ærn, ern a place] A meeting-place, senate-house, hall; conveniendi locus, aula :-- Ahleópon ðá ealle, and hine mid heora metseaxum ofsticedon on heora gemótærne [MS. gemóterne] then [the consuls and the senate] all jumped up, and stabbed him [Julius Cæsar] with their daggers in their senate-house, Ors. 5, 12; Bos. 112, 25. Gemótern in pretorio, Mt. Kmbl. Lind. 27, 27. gemot-ærn