There are two prominent people named kings named Manasseh in the Bible and both of their profiles are included below:
Manasseh was the older son of Joseph and Asenath, daughter of Potiphera (priest of the sun god Re of heliopolis). Manasseh is the ancestor of the Tribe of Manasseh. According to 1 Chronicles 7:14, Manasseh had an Aramean concubine who bore Machir, the father of Gilead.
When Jacob blessed his grandsons Manasseh and Ephraim, he gave the preferential treatment to Ephraim, instead of the older brother Manasseh, explaining that Ephraim would become greater than Manasseh. Before his death Jacob adopted his grandchildren Manasseh and Ephraim to be equal with his own sons (Genesis 48:5). The tribe of Manassah is the only tribe that settled on both sides of the Jordan River.
In the census taken in Numbers 26, Manasseh had 52,700 men who were twenty-years old or older, and Ephraim had 32,500. When added together, the sons of Joseph totaled 85,200, which was more than any other of Jacob's sons. In Revelation 7:1-8, Manasseh is mentioned as one of the tribes receiving the Seal of God for 12,000 of its members. The name Manasseh means "to forget."
Manasseh, son of King Hezekiah, and mother Hephzibah, began his reign at age 12. He reigned 55 years, the longest of any Hebrew King, but it was an evil reign. He rebuilt the heathen altars that his father Hezekiah had destroyed - the altars of Baal. He even built pagan altars in both courts of the Temple of the Lord, for worshiping the sun, moon and stars.
And Manasseh sacrificed his own children as burnt offerings in the valley of Hinnom. He consulted spirit mediums, fortune tellers and sorcerers. He angered the Lord by encouraging every sort of evil (2 Chronicles 33:4-6). He also murdered large numbers of innocent people (2 Kings 21:16).
Warnings by the Lord were ignored by both Manasseh and his people, so God sent the Assyrian armies, who captured him and took him into exile. It was in captivity that he came to his senses and cried out to God for help. As recorded in 2 Chronicles 33:13, The Lord answered his prayers by returning him to Jerusalem. At that point Manasseh realized that the Lord was really God.
Manasseh removed the foreign idols from the hills and the Temple and tore down the pagan altars. He then rebuilt the altar of the Lord, and offered sacrifices upon it. When Manasseh died, he was buried beneath his own palace, and his son Amon became the new king. The story of Manasseh is found in 2 Kings 21:1-17, and 2 Chronicles 33:1-20.
Interesting fact: The Lord had told Manasseh's father, Hezekiah, who was deathly sick, to prepare to die (2 kings 20:1). When Hezekiah broke down, cried and prayed to God, The Lord added 15 years to Hezekiah's life. Three years later his son, Manasseh, was born. If Hezekiah had accepted death when first told by the Lord, then his son Manesseh, the most evil of kings, would have never been born.
Next person in the Bible: Manoah