Reiks (pronunciation /ri:ks/; Latinized as rix) is a Gothic title for a tribal ruler, often translated as "king". In the Gothic Bible, it translates to the Greek árchōn (ἄρχων).[2] It is presumably translated as basiliskos (βασιλίσκος "petty king") in the Passio of Sabbas the Goth.[3]

The Gothic Thervingi were divided into subdivisions of territory and people called kunja (singular kuni, cognate with English kin), by a reiks. In times of a common threat, one of the reiks would be selected as a kindins, or head of the Empire (translated as "judge", Latin iudex, Greek δικαστής).

Herwig Wolfram suggested the position was different from the Roman definition of a rex ("king"), and is better described as that of a tribal chief (see Germanic king).[4] A reiks had a lower order of optimates or megistanes​ (μεγιστάνες, presumably translating mahteigs) beneath him, on whom he could call on for support.

The term reiks is the origin of the Celtic word adopted from the early Germanic peoples (as *rīks; see also Reich). Later also adapted into both Greek and Latin.

It also figures prominently as second element in Gothic names, Latinized as -rix, and often anglicized as -ric, e.g. in Theoderic (Þiuda-reiks). The use of the suffix extended into the Merovingian dynasty, with kings given names such as Childeric,[5] and it survives in modern German and Scandinavian names such as Ulrich, Erik , Dietrich, Heinrich, Richard, Friedrich.