The ‘O’ antiphon for 22nd of December is ‘O Rex gentium’ (O King of all nations). This anthiphon – the 6th Antiphon for the Magnificat is based upon two verses in Isaiah Isaiah 9:6:
6 Parvulus enim natus est nobis, et filius datus est nobis, et factus est principatus super humerum ejus : et vocabitur nomen ejus, Admirabilis, Consiliarius, Deus, Fortis, Pater futuri sæculi, Princeps pacis. (6 For a CHILD IS BORN to us, and a son is given to us, and the government is upon his shoulder: and his name shall be called Wonderful, Counsellor, God the Mighty, the Father of the world to come, the Prince of Peace).
and Isaiah 2:4:
4 Et judicabit gentes, et arguet populos multos; et conflabunt gladios suos in vomeres, et lanceas suas in falces. Non levabit gens contra gentem gladium, nec exercebuntur ultra ad prælium. (4 And he shall judge the Gentiles, and rebuke many people: and they shall turn their swords into ploughshares, and their spears into sickles: nation shall not lift up sword against nation, neither shall they be exercised any more to war).
It’s sung below by Peter Morton (tenor), and the Choir of St John’s College Cambridge, conducted by David Hill.