What is "limigantes"

The Limigantes was a Sarmatian people that lived by the Tisza river, in Banat, in the 4th century. They are attested by Roman historian Ammianus Marcellinus ( 390).

Roman historian Ammianus Marcellinus ( 390) described the Limigantes as Sarmatae servi ("Sarmatian slaves/serfs"), as opposed to the Arcaragantes, Sarmatae liberi ("free Sarmatians"). It is unclear whether the Limigantes were simply an under-class of ethnic Sarmatians or a non-Sarmatian subject people.