Vikrāntavarman I or Prakāśadharma (?–686 AD), was a king of Champa from the Gangaraja (Simhapura) dynasty, modern-day Central Vietnam, reigning from 653 to 686.
It was highly likely that Prakāśadharma had spent some of his courtier and vacational times in the city of Viṣṇupura (at present day Cổ Thành, Quảng Trị, east of the Thạch Hãn River).
Palaeographists however keep a skeptic that a straightforward identification of the data of medieval Chinese sources about the kingdom of Lam Ap/Linyi with epigraphic evidence of the Thu Bon River Valley is hardly plausible.
When Prabhasadharma's male descendants were put to death by a minister, Jagaddharma, one of his nephew who had escaped, traveling to the Khmer city Bhavapura (Sambor Prei Kuk) and then got married with Queen Śarvānī, daughter of Zhenla king Isanavarman, and gave birth to Prakāśadharma.
[3] Prakāśadharma's words proved himself a sophisticated, well-educated monarch in cosmopolitan Sanskrit learning and Indian philosophy.
However, recent research shows indications that there is a king Naravāhanavarman ruled briefly between Prakāśadharma and Vikrantavarman II.