Question: Who's death stopped His Imperial Majesty's Own Chancellery?

Context paragraphs:
Office of the Institutions of Empress Maria: The Office of the Institutions of Empress Maria (Ведомство учреждений императрицы Марии) was the name of the Imperial government office of charity in Imperial Russia, and the 4th branch of His Imperial Majesty's Own Chancellery between 1828 and 1917.  It was named after empress Maria, who united her management of the Moscow Orphanage with that of the orphanage and the Foundling Hospital (St. Petersburg) on 2 May 1797.  After the death of Maria in 1828, it was incorporated into the office of the Tsar: it was given the above name in 1854.  The office was abolished in 1917.

MS Regal Empress: MS "Regal Empress was a cruise ship that recently operated for Imperial Majesty Cruise Line.  She was built in 1953 by Alexander Stephen & Sons at Glasgow, Scotland as the ocean liner SS "Olympia for the Greek Line.  Greek Line withdrew the "Olympia" from service in 1974.  Following an extended lay-up period and reconstruction into a diesel-engined Caribbean cruise ship, the ship re-emerged in 1983 as MS "Caribe I" for Commodore Cruise Line.  In 1993 she was sold to Regal Cruise Line and received her final name.  She operated for Imperial Majesty Cruise Line from 2003 until 2009.  The "Regal Empress" was also the last vintage passenger ship to regularly sail from the United States.

Imperial Majesty (style): Imperial Majesty ("His/Her Imperial Majesty", abbreviated as "HIM") is a style used by emperors and empresses.  It distinguishes the status of an emperor/empress from that of a king/queen, who are simply styled Majesty.  Holders of this style have sometimes been observed to follow religious leaders who are styled "His Holiness" in public ceremonies.

Third Section of His Imperial Majesty's Own Chancellery: Third Section of His Imperial Majesty's Own Chancellery

Svita: His Imperial Majesty's Retinue, "His Imperial Majesty's Suite" (abbr.  "H. I. M. Retinue", "H. I. M. Suite"; Russian: Свита / Svita, e.g. "Свита Его Императорского Величества, Е.  И.  В.  Свита" ) was a retinue unit of personal aides to the Russian Emperor, who usually were officers of the Army or the Guards units.

Augsburg Interim: The Augsburg Interim (""Declaration of His Roman Imperial Majesty on the Observance of Religion Within the Holy Empire Until the Decision of the General Council"") was an imperial decree ordered on 15 May 1548 at the 1548 Diet of Augsburg by Charles V, Holy Roman Emperor, who had just defeated the forces of the Protestant Schmalkaldic League in the Schmalkaldic War of 1546/47.  Although it ordered Protestants to readopt traditional Catholic beliefs and practices, including the seven Sacraments, it allowed for Protestant clergymen the right to marry and for the laity to receive communion in both kinds (bread and wine).  It is considered the first significant step in the process leading to the political and religious legitimization of Protestantism as a valid alternative Christian creed to Roman Catholicism finally realized in the 1552 Peace of Passau and the 1555 Peace of Augsburg.  The Interim became Imperial law on 30 June 1548.  The Pope advised all bishops to abide by the concessions made to the Protestants in the Interim in August 1549.

His Imperial Majesty's Own Chancellery: His Imperial Majesty's Own Chancery or H.I.M. Own Chancery (Russian: Собственная Его Императорского Величества канцелярия, Собственная Е.И.В.  канцелярия ) began as personal chancery of Pavel I and grew into a kind of regent's office, run by Count Arakcheyev from 1815 and until the death of Alexander I of Russia.

Alexander I of Russia: Alexander I (Russian: Александр Павлович , Aleksandr Pavlovich; 23 December [O.S. 12 December] 1777 – 1 December [O.S. 19 November] 1825 ) reigned as Emperor of Russia from 23 March 1801 to 1 December 1825.  He was the son of Paul I and Sophie Dorothea of Württemberg.  Alexander was the first Russian King of Poland, reigning from 1815 to 1825, as well as the first Russian Grand Duke of Finland.  He was sometimes called Alexander the Blessed.

Imperial Majesty Cruise Line: Imperial Majesty Cruise Line was a budget cruise line that had operated 2 and 3 day voyages out of Port Everglades, Florida to Nassau, Bahamas.  The company was founded in 1999.  The cruise line attracted both vacationers and vintage ship fans from around the world.  The cruise line's current operations ended on March 9, 2009, when the Regal Empress was retired.  In that same week, its operations were replaced by another cruise line operating for the same company that Imperial Majesty was part of.

Northern Bee: Northern Bee (Russian: Северная пчела ) was a semi-official Russian political and literary newspaper published in St. Petersburg from 1825 to 1864.  It was an unofficial organ of Section Three (the Third Section of His Imperial Majesty's Own Chancellery) - the secret police.

Supporting paragraphs: His Imperial Majesty's Own Chancellery Alexander I of Russia
Answer: Alexander I of Russia