The Vicar (Great Logothete) of the Sovereign Knightly Order of the Jerusalem Cross, prince Alexander Sergeev-Zarnadze, was born on the 20th of January 1961 in Moscow region (Bolshevo). Married. In 1978 completed secondary education. From 1979 to 1981 he served in the army. In July 1982 was matriculated at All-Soviet Law Institute. Worked as a loader. In the period from 1984 to 1988 participated in the construction and restoration of Saint Daniel Monastery in Moscow. In 1989, on the invitation of Metropolitan Vitaliy, First-Hierarch of the Russian Orthodox Church Abroad, visited Canada, then the USA, where was ordained subdeacon by the First-Hierarch and entered the Holy Trinity Seminary in Jordanville, New-York. From 1989 to 1994 was Metropolitan Vitaliy’s representative in Russia.

In December 1990 was sent on mission to Australia, where for zealous service he was decorated with a St. Vladimir Cross by Archbishop Paul of Sydney, Australia and New Zealand. On the 22nd of May 1995 was ordained deacon, and on the 6th of January 1996 became a priest. Served in the Russian True-Orthodox Church and the Montenegrin Orthodox Church. In September 2003, protopresbyter Alexander moved to the Romanian Orthodox Church, and was appointed Authorized Representative of the Bessarabian Metropolitan in Russia. In 2018 retired. In January 2005 took the direction of a Sovereign Knightly Order of the Jerusalem Cross.

March 15, 2009 – awarded with St George’s Cross of Bessarabia by His Eminence Petru, Archbishop of Chisinau and Metropolitan of Bessarabia. May 25, 2014 – His Highness Prince Nugzar Bagration-Gruzinsky, heir to the Georgian throne, Head of the House of Bagrationi, conferred the title of a Knight of the Grand Cross of the Georgian Royal Dynasty Order of Crown. June 1, 2016 — His Highness Prince Igor Sibirsky, Head of the Genghis Khan House of Tsareviches and Princes of Siberia granted the title of a prince of the Royal House of Siberia. February 15, 2017 was awarded the dynastic Order of the Siberian Kingdom.