Most Excellent Majesty is a form of address in the United Kingdom. It is mainly used in Acts of Parliament, where the phrase "the Queen's [King's] most Excellent Majesty" is used in the enacting clause.
The standard is as follows:
The phrase is also used in the enacting clause of appropriations acts of the Parliament of Canada, as illustrated in the following examples from the Appropriation Act No. 4, 2015–16:
References
Most Excellent Majesty Wikipedia(Text) CC BY-SA