Vardanes I was a king of the ancient Persian Empire, specifically from the Arsacid dynasty, ruling around 40-45 AD. He was the son of Vonones I and is known for his efforts to consolidate power in Parthia, a region that was often contested by various factions. His reign was marked by internal strife and challenges from rival claimants to the throne. During his rule, Vardanes I faced opposition from his brother, Gotarzes I, which led to a civil war. Despite his attempts to strengthen his position, he struggled to maintain control over the kingdom. Ultimately, Vardanes I's reign ended with his death, leading to further instability in the region.