The Masraige (/masrəɣʲi/) were a semi-legendary Fir Bolg tribe inhabiting Magh Slécht in County Cavan, Ireland.
[1] In the Annals of the Four Masters, they are mentioned as having killed Conall Gulban -"M464.3 Conall Gulban, son of Niall of the Nine Hostages (from whom are descended the Cinel Conaill), was slain by the old tribes of Magh Slecht, he having been found unprotected, and was buried at Fidhnach Maighe Rein, by Saint Caillín, as the Life of the aforesaid saint relates.
Conall, on hearing the shoutings, proceeded with the small number that was near him at the time; and he ceased not from [pursuing] them until he came to Dun-Conaing on Magh-Rein, to wit, Fidhnacha at this day.
In pursuit of horses he stoutly came, from the east, from Tara of the flocks, with a small company; 'twas a foolish journey, for he was slain by the old Tuatha-Slecht.
found the man at a disadvantage.The Masraige were one of the Aithechthúatha, a generic designation for certain Irish ethnic groups, usually translated as "rent-paying tribes", "vassal communities" or "tributary peoples".