Final answer:
The claim that Nestorius wanted to downgrade Mary's importance is false; he was involved in a theological debate over the nature of Christ. Additionally, William of Orange was married to James II's daughter, Mary, making him a legitimate successor to the English throne.
Step-by-step explanation:
The statement that Bishop Nestorius wanted to downgrade Mary's importance is False. Nestorius, who became Bishop of Constantinople in 428, provoked a major controversy in the early Christian Church concerning the nature of Jesus Christ and the title of Mary as Theotokos (God-bearer or Mother of God). His views were seen as a challenge to the orthodox doctrine that Jesus has two natures, divine and human, united in one person. Nestorius was not aiming to diminish Mary's importance but was rather concerned with a theological distinction regarding the nature of Christ. He suggested calling Mary Christotokos (Christ-bearer) to emphasize the human nature of Jesus, which led to the accusations of dividing His person into two separate entities.
This controversy led to the Council of Ephesus in 431, where Nestorius' teachings were declared heretical, and the title Theotokos for Mary was affirmed. It should be understood that the matter at hand was a theological debate about the nature of Christ rather than a direct attempt to undermine the significance of Mary.
Moreover, to answer the question related to William of Orange and James II's daughter, Mary, the correct answer is True. William of Orange was married to James II's daughter, also named Mary, and due to this marriage and his own position, he was indeed in line for the throne of England, which he later took as part of the Glorious Revolution.