Why did Ibn Taymiyyah contradict the scholarly consensus (Ijma') on several issues in fundamental principles (Usul) and subsidiary matters (Furu'), and introduce innovations (Bid'ah) that no Muslim had ever preceded him in?

The fabrications and lies mentioned about Ibn Taymiyyah were circulated by his enemies and the enemies of the Sunnah. He appeared after a period of superstitions and innovations, so he renewed the landmarks of the religion and purged it of the innovations that had become attached to it. His defense of the Sunnah caused him animosity with some scholars of his era, who then slandered him and incited rulers against him, yet he persevered. Those who came after him defended him and his call, and the praise of scholars for him became widespread. To ascertain the truth of his statements and the praise of scholars for him, one can refer to the mentioned books and fatwas.