Which Jewish king ordered the death of the Prophet Isaiah?

The Prophet Isaiah died a martyr’s death. By order of the Jewish king Manasseh he was sawn through by a wood-saw. The prophet was buried not far from the Pool of Siloam. The relics of the holy Prophet Isaiah were afterwards transferred by the emperor Theodosius the Younger to Constantinople and installed in the church of Saint Laurence at Blachernae. The head of the Prophet Isaiah is preserved at Athos in the Hilandar monastery.

Manasseh was a king of the Kingdom of Judah. He was the oldest of at least two sons of Hezekiah and his wife Hephzibah. He became king at the age of 12 and reigned for 55 years. Edwin Thiele has concluded that he commenced his reign as co-regent with his father Hezekiah in 697/696 BC, with his sole reign beginning in 687/686 BC and continuing until his death in 643/642 BC.