Answer:
Clause 12 of the Magna Carta declared that taxes shall be levied in our kingdom only by the common consent of our kingdom." This meant that the king could not demand taxes without an agreement of his advisers. This was much like the "No taxation without representation." in the United States.
Step-by-step explanation:
Without knowing the specific context, it's difficult to say what promise was made in 'clause 12'. The term 'clause 12' generally refers to a specific condition agreed upon in a legal contract, constitution or other legal document. However, it's not universally defined and varies from document to document. For instance, in a leasing contract, 'clause 12' might discuss provisions concerning termination whereas in a company's constitution, it might pertain to powers of directors. Therefore, without knowing the exact context, it's not possible to identify the promise made in 'clause 12'. I would recommend referring back to the specific document that the question refers to for the most accurate information.