your grace

pronoun2

1. •
   (formal) A title of respect used when addressing a duke or duchess or other high noble of equivalent rank.
2. •
   (formal, no longer used) you (as a polite form of address to social superiors)

pronoun3

1. •
   Used in direct address to archbishops.
2. •
   Used in direct address to bishops, although in British English sometimes only granted to the Bishop of Meath and Kildare in Ireland.
3. •
   (UK) Used in direct address to dukes and to Lord High Commissioners.