Final answer:
Dhu Nuwas, the King of Himyar, began the persecution of Jews who refused to convert to Greek forms of worship.
Step-by-step explanation:
The notorious king who began the persecution of Jews who refused to convert to Greek forms of worship was Dhu Nuwas. Dhu Nuwas was the King of Himyar (modern-day Yemen) in the early 6th century. He conducted a military campaign against Ethiopians and Christians in his kingdom, executing hundreds of Christians and forcibly converting others to Judaism.