Patronage (clientela) was the distinctive relationship in ancient Roman society between the patronus ('patron') and their cliens ('client'). Apart from the patron-client relationship between individuals, there were also client kingdoms and tribes, whose rulers were in a subordinate relationship to the Roman state.
The relationship was hierarchical, but obligations were mutual. The patron was the protector, sponsor, and benefactor of the client; the technical term for this protection was patrocinium. Although typically the client was of inferior social class, a patron and client might even hold the same social rank, but the former would possess greater wealth, power, or prestige that enabled him to help or do favors for the client.