Tiridates III ( or Trdat III ) was the king of Armenia ( 286-330 ) , and was also known as Tiridates the Great . ( Some scholars may be wrong because they call him as Trdat IV as a result of the fact that Tiridates I of Armenia reigned twice . ) Tiridates III ( or Trdat III ; Armenian : ; 250 -- c. 330 ) was the king of Arsacid Armenia ( 285-339 ) , and is also known as Tiridates the Great ; some scholars incorrectly refer to him as Tiridates IV as a result of the fact that Tiridates I of Armenia reigned twice ) .