The Head of the Russian Imperial House, H.I.H. The Grand Duchess Maria of Russia, her son and heir, H.I.H. The Grand Duke George of Russia, and his spouse H.S.H. Princess Victoria Romanovna, are deeply saddened by the death of H.M. King Constantine II of the Hellenes (1940-2023), who passed away in Athens on 10 January 2023, and pray for the repose of his soul and extend their sincere condolences to the Head of the Greek Royal House, Prince Pavlos, Queen Anne-Marie, and all the Royal Family and people of Greece.
https://imperialhouse.ru/en/allnews-en/news/2023-01-11-the-head-of-the-house-of-romanoff-mourns-the-death-of-king-constantine-ii-of-the-hellenes.html#sigProId16bfa0ebea
King Constantine II was the great-grandson of Grand Duchess Olga Konstantinovna of Russia (1851-1926), Queen of the Hellenes, granddaughter of Emperor Nicholas I of Russia (1796-1855), and spouse of King George I of the Hellenes (1845-1913).
King Constantine II acceded to the throne in 1964 upon the death of his father, King Pavlos I of the Hellenes (1901-1964) and was removed from power as a result of a military coup by the “black colonels” in 1967.
The newly reposed king was the godfather of Grand Duke George of Russia.
Grant, O Lord, eternal rest, in blessed repose, to Thy servant King Constantine, and may his memory be eternal!