Dacian, an Indo-European language, is attested only by few glosses and personal names. No example of adjective valence is attested.

Bibliography:

Reichenkron, Günter. 1966. Das Dakische (rekonstruiert aus dem Rumänischen). Heidelberg: Carl Winter Verlag.

Visscher, M.S. 2011. Landscape of Languages: The position of provincial languages in the Roman Empire in the first three centuries AD. Leiden University. 90pp. (MA thesis).