Title: Tiridates (son of Tiran of Armenia)
Content:  Tiridates (Տրդատ, flourished 4th century, died between 364 and 375) was a Prince from the Arsacid dynasty of Armenia. Tiridates was the third born son to the Roman Client King of Armenia, Tiran (Tigranes VII) who reigned from 339 until 350 by an unnamed wife. Tiridates’ second oldest brother was his father’s successor Arsaces II (Arshak II), who reigned as Roman Client King of Armenia from 350 until 368. Tiridates was the namesake of his paternal great-grandfather Tiridates III of Armenia, a previous Armenian King and was also the namesake of his Armenian and Parthian ancestors who ruled with this name as King. The Sassanid King Shapur II launched a war on Rome and her allies, firstly by persecuting the Christians that lived in Persia and 
Title: Tiridates III of Armenia
Content:  Tiridates III (Armenian: Տրդատ Գ Trdat III; c. AD 250 – c. 330), also known as Tiridates the Great (Տրդատ Մեծ Trdat Mets), or Tiridates IV, to distinguish him from another Tiridates thought to have ruled several years earlier, was an Armenian Arsacid king (298 – c. 330). In 301, Tiridates proclaimed Christianity as the state religion of Armenia, making the Armenian kingdom the first state to embrace Christianity officially.
Title: Tiridates I of Armenia
Content:  Tiridates I (, Tīridāt; Τιριδάτης, Tiridátes) was King of Armenia beginning in 53 CE and the founder of the Arsacid dynasty of Armenia. The dates of his birth and death are unknown. His early reign was marked by a brief interruption towards the end of the year 54 and a much longer one from 58 to 63. In an agreement to resolve the Roman–Parthian conflict in and over Armenia, Tiridates I (one of the brothers of Vologases I of Parthia) was crowned king of Armenia by the Roman emperor Nero in 66; in the future, the king of Armenia was to be a Parthian prince, but his appointment required approval from the Romans. 
Title: Tiridates III of Armenia
Content:  Tiridates III was the son of Khosrov II of Armenia, the latter being assassinated in 252 by a Parthian agent named Anak under orders from Ardashir I. Tiridates had at least one sibling, a sister called Khosrovidukht and was the namesake of his paternal grandfather, Tiridates II of Armenia. Anak was captured and executed along with most of his family, while his son, Gregory the Illuminator, was sheltered in Caesaria, in Cappadocia. As the only surviving heir to the throne, Tiridates was quickly taken away to Rome soon after his father's assassination while still an infant. He was educated in Rome and was skilled in languages and military tactics; in addition he firmly understood and appreciated Roman law. The Armenian historian Movses Khorenatsi described him as a strong and brave warrior, who participated in combat against his enemies, and personally led his army to victory in many battles.
Title: Tiridates (son of Tiran of Armenia)
Content:  and his army out from Armenia. After Shapur II was defeated, he had signed a treaty and Tiridates with members of his family were released from prison. As Tiridates’ father being depressed and blinded from his experience in captivity, had abdicated his throne and Arsaces II succeeded their father as Armenian King in 350. Not much is known on his life and his relationship with Arsaces II. During the reign of the Roman emperor Valentinian I, who ruled from 364 until 375, Tiridates was sent as a political hostage to Constantinople and was executed on the orders of Valentinian I during Arsaces II’s reconciliation with the Sassanid Empire. Tiridates married an unnamed woman by whom he had a son called Gnel, also known as Gnelus.
Title: Tirit of Armenia
Content:  Tirit also known as Tirid (flourished 4th century, died 359 ) was a Prince from the Arsacid dynasty of Armenia. Tirit was the son born to Artaxias by an unnamed mother, hence his paternal uncle was Arsaces II (Arshak II) who ruled as Roman Client King of Armenia from 350 until 368 and was a grandson to the previous ruling Roman Client Armenian King Tiran (Tigranes VII) who ruled from 339 until 350. Tirit was most probably born and raised during the reign of Tiran. His father died at an unknown date during the reign of Tiran. Sometime during the reign of his paternal grandfather, the Sassanid King 
Title: Tiridates III of Armenia
Content:  In 270 the Roman emperor Aurelian engaged the Sassanids, who had now replaced the Parthians, on the eastern front and he was able to drive them back. Tiridates, as the true heir to the now Persian-occupied Armenian throne, came to Armenia and quickly raised an army and drove the enemy out in 298. When Tiridates returned to Armenia, he made the city of Vagharshapat his capital, as it had been the capital of his late father. For a while, fortune appeared to favour Tiridates. He not only expelled his enemies, but he carried his arms into Assyria. At the time the Persian Empire was in a distracted state. The throne was disputed by the ambition of two contending brothers, Hormuz and Narses. The civil war was, however, soon terminated and Narses was universally acknowledged as King 
Title: Tiridates II of Armenia
Content:  the possibility that the Mamikonian family immigrated from Bactria to Armenia. Tiridates II was the first king of Armenia to persecute Christians. This persecution continued under his successors. Partly due to his long reign, Tiridates II became one of the most powerful and most influential Armenian monarchs from the Arsacid dynasty. In 224, the Parthian Empire was destroyed. The last king, Artabanus V of Parthia, who was Tiridates II's paternal uncle, was killed by Ardashir I, the first king of the Sassanid Empire. Between 226 and 228, after annexing Parthia, Ardashir I wanted to expand his Empire to include Armenia. After 
Title: Tiridates II of Armenia
Content:  Tiridates II (Տրդատ Բ, flourished second half of the 2nd century - died 252), known in Armenian sources as Khosrov, was an Armenian Parthian Prince who served as a Roman Client King of Armenia. Tiridates II was the son and heir of the Armenian King Khosrov I. Between 214 and 216, Tiridates II and his family were held in detention by the Romans which provoked a major uprising in Armenia against Rome. In 215, the Roman emperor Caracalla led the Roman army and invaded Armenia to end the uprising. In 217 Khosrov I had died and Tiridates II succeeded his father 
Title: Tiridates III of Armenia
Content:  Persia. Narses then directed his whole force against the foreign enemy. The contest then became too unequal. Tiridates once more took refuge with the Romans. The Roman-Armenian alliance grew stronger, especially while Diocletian ruled the empire. This can be attributed to the upbringing of Tiridates, the consistent Persian aggressions and the murder of his father by Anak. With Diocletian's help, Tiridates pushed the Persians out of Armenia. In 299, Diocletian left the Armenian state in a quasi-independent and protectorate status possibly to use it as a buffer in case of a Persian attack. In 297, Tiridates married an Alani Princess called Ashkhen, by whom he had three children: a son called Khosrov III, a daughter called Salome, and another daughter who married St. Husik I, one of the earlier Catholicoi of the Armenian Apostolic Church.

Question: Who is the father of Tiridates III of Armenia?
Answer: Khosrov II of Armenia.
Chosroes.