Relating to or comprising a set of three related people or things.
“Structures like this triadic group have been found in other early Mayan cities”
Itinerant (adj) (noun)
Travelling from place to place. / A person who travels from place to place.
Late 16th century (used to describe a judge travelling on a circuit): from late Latin itinerant- ‘travelling’, from the verb itinerari, from Latin iter, itiner- ‘journey, road’.