This page contains official letters from the Monarchs and their family members, the Heads of the State, the Monarchs in Exile, the Heads of Church Organizations and Knightly Orders.

 Kingdom of Spain
 H.M. King Felipe VI
 Royal House of Iran
 H.M. Shahbanu (Empress) Farah Pahlavi
 (reigns in 1967-1979; Head of House in 1980-1981)
 Ordo Supremus Militaris Templi Hierosolymitani
 H.G. Alexey Andreyev, Prior of Russia
 Grand Duchy of Luxembourg
 H.R.H. Grand Duke Jean
 (reigns in 1964-2000)
 Principality of Liechtenstein
 H.S.H. Prince Hans-Adam II
 H.S.H. Hereditary Prince Alois, Prince-Regent of Liehtenstein
 Kingdom of Denmark
 H.M. Queen Margrethe II
 H.R.H. Prince Consort Henrik
 Royal House of Mewar
 H.H. Maharana Shriji Arvind Singh Mewar of Udaipur, 76th custodian of the Dynasty
 Kingdom of Spain
 H.M. King Felipe VI
 (3rd anniversary of the accession to the trone)
 Royal House of Qu'aiti
 H.H. Sultan Ghalib II bin Awadh Al-Quaiti
 (reigns in 1966-1967)
 The United States of America.
 Commonwealth of Kentucky.
 The United States of America.
 Commonwealth of Kentucky.
 Hon. Governor Mattew G. Bevin
 Faroe Islands.
 Prine Minister Aksel V. Johannesen 
 Vatican City State.
 H.H. Pope Benedict XVI
 (Pope 2005-2013; Pope Emeritus from 2013) 
 Kingdom of Cambodia.
 H.M. King Norodom Sihamoni
 Ecumenical Patriarchate of Constantinople.
 H.E. Metropolitan Polykarpos of Spain and Portugal,
 Ipertim and Exarch of Mediterranean See
 Kingdom of Belgium
 H.M. King Philippe
 Cystody of the Holy Land
 Kingdom of Bunyoro-Kitara
 H.M. Omukama Solomon Uguru I
 Principality of Monaco
 H.S.H. Prince Albert II