Why Parliament restricts appeals to the monarch

Why is there a taboo against invoking members of the Royal Family in Parliament?

The convention keeps the monarch and Royal Family from being used to influence debate, while allowing references in defined formal and funding contexts.

Parliamentary convention prevents members from invoking the monarch or royal family to influence debate. References remain possible in defined settings such as Royal Household funding or formal royal occasions, but the monarch's personal name should not become political leverage. Erskine May records the procedural rule, which reflects the long conflict over the relationship between Crown and Parliament, including the English Civil War. Parliamentary arguments must therefore stand without an implied royal endorsement.