Why did King James I object to Sir Edward Coke’s ruling in Fuller’s Case?

King James I objected to Sir Edward Coke’s ruling in Fuller’s Case (1607–1608) because Coke asserted the supremacy of the common law over royal authority.

During a disputation regarding the king's power to withdraw cases from the courts, Coke infuriated James I by declaring that "the king in his own person cannot adjudge any case." This stance directly challenged the Stuart claims of royal prerogative, as it established that the king could not interfere with the jurisdiction of the common-law courts or act as a judge in his own right.1