Noun
lanista (plural lanistas or lanisti)
(historical) The trainer or manager of a team of gladiators.
In the Eastern provinces of the later Imperium, the state archiereis combined the roles of editor, Imperial cult priest and lanista, giving gladiatoria munera in which the use of sharp weapons seems an exceptional honour. Source: Internet
In the Republican era, private citizens could own and train gladiators, or lease them from a lanista (owner of a gladiator training school). Source: Internet