my Lord vs your Grace

my Lord

noun
  • Used in direct address to bishops, particularly Anglican ones. 

  • Used in direct address to peers of the realm, usually now excluding dukes and the Lords Spiritual. 

  • Used in direct address to the Lord Mayors of certain important cities, including London and Canterbury. 

  • Used in direct address to certain judges, particularly High Court Judges and above. 

your Grace

noun
  • Used in direct address to archbishops. 

  • Used in direct address to dukes and to Lord High Commissioners. 

  • Used in direct address to bishops, although in British English sometimes only granted to the Bishop of Meath and Kildare in Ireland. 

How often have the words my Lord and your Grace occurred in a corpus of books? (source: Google Ngram Viewer )