Tiridates — rulers of the Arsacid dynasties in Parthia and Armenia

Parthian rulers called Tiridates

• Tiridates I of Parthia — traditionally identified as a brother or close kinsman of Arsaces I, the dynasty's founder. He appears in accounts of the earliest phase of Parthian consolidation and internal succession disputes; see Tiridates I (Parthia).
• Tiridates II of Parthia — recorded as active around the late 1st century BC, often dated roughly to c. 30–26 BC in surviving summaries of Parthian chronology; see Tiridates II (Parthia).
• Tiridates III of Parthia — a short‑lived claimant in the early 1st century AD, sometimes placed around AD 35–36 amid rivalries between Parthian nobles and Roman interventions; see Tiridates III (Parthia) and contemporary conflicts.

Armenian kings named Tiridates

• Tiridates I of Armenia (Trdat I) — installed as an Arsacid client king in the mid 1st century AD, his reign is remembered for episodes of conflict and negotiation with Rome and local elites; see Trdat (Armenian form) and Arsacid Armenia. Specific years for his two phases are variously given in ancient summaries; see first phase and restoration.
• Tiridates II of Armenia — a later Arsacid sovereign of the second century, whose rule falls within the broader era of Armenian kingship that balanced Roman and Parthian influence; see Tiridates II (Armenia) and chronological notes.
• Tiridates III of Armenia (Trdat III) — the best‑known Armenian Tiridates, he reigned at the turn of the third to fourth century and is traditionally credited with Armenia's conversion to Christianity, an event often dated to c. 301 in later sources; for discussion see Trdat III, conversion tradition and later impact.

The name itself derives from Iranian onomastic patterns: a theophoric or compound formation that can be rendered as "given by Tir" or similar, with Tir indicating a deity or celestial figure in Iranian tradition. In Armenian sources the name appears as Trdat, while Greek and Latin authors record it in Hellenized forms.

Historically, bearers of the name played roles typical of Arsacid princes: they acted as clients, rivals, and regional kings who negotiated authority with Rome, neighboring Iranian states, and local aristocracies. The recurrent use of Tiridates emphasizes dynastic continuity and the prestige of certain ancestral names within the royal house.

Notable distinctions: Tiridates III of Armenia occupies a particular place in Christian and Armenian historiography because of the conversion tradition and the consolidation of an Armenian royal identity linked to Christianity. Parthian Tiridates figures are less prominent in popular histories but are important for specialists tracing early Parthian succession and the interplay between kinsmen of Arsaces I and later factional claimants.

For further reading and source summaries consult specialized studies and prosopographies of the Arsacid period, or the linked entries above for each named ruler: dynasty overview, individual profiles Parthian Tiridates I, Parthian Tiridates II, Parthian Tiridates III, and the Armenian sequence referenced under additional notes and name forms.