When addressing an ambassador, is it
I agree with your excellency.
or should your, excellency, or both be capitalized?
Likewise with "your majesty" and "your holiness".
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All those should be capitalised as they refer to specific dignitaries. In the same way you capitalise Q for Queen if you are speaking about a specific person, past or present e.g. Queen Anne, Queen Elizabeth ll etc.
If you are just writing about any king, or an ambassador you would not capitalise any of it.
e.g. 'At a service for commemoration for a late king, one would expect many excellencies to be in attendance'.