March – John Scott Russell's Scottish Steam Carriage Company begins operating a regular passenger service in west central Scotland on the open road between Glasgow and Paisley, Renfrewshire.
May 9 – The founder of the Second Saudi State, Imam Turki bin Abdullah Al Saud, is assassinated after the Friday prayers by Ibrahim Hamza, following the orders of his cousin Mishari.
July 8 – Imam Faisal bin Turki enters Riyadh and upon entering his father's palace, assassinates his father's murderer, Ibrahim Hamza, and his master; Mishari, and becomes the ruler and founder of the Second Saudi State.
August 12 – In the Empire of Brazil, the Additional Act provides for establishment of the Provincial Legislative Assembly, extinction of the State Council, replacement of the Regency Trina, and introduction of a direct and secret ballot.
October 16 – The Palace of Westminster is destroyed by fire, along with both the House of Commons and the House of Lords (which are not in session) of the British Parliament. An investigation later traces the disaster to an order from the Exchequer to the Board of Works to destroy the tally sticks that had been stored as part of record keeping, the use of the furnaces beneath the House of Lords to carry out the task, and the failure of authorities to stop the work or to fight the fire after smoke had first been detected, the conclusion being that the fire was "wholly attributable to carelessness and negligence."[7]
Charles Babbage begins the conceptual design of the Analytical Engine, a mechanical forerunner of the modern computer. It will not be built in his lifetime.[10][11]
Thomas Davenport, inventor of the first American DC electrical motor, installs his motor in a small model car, creating one of the first electric cars.
The Romanian language is banned in the schools and government facilities of the Russian Empire's Bessarabia Governorate.[12]
Heinrich von Treitschke (15 September 1834 – 28 April 1896) German historian, political writer, and National Liberal member of the Reichstag during the time of the German Empire.
^"Shipping Intelligence". Liverpool Mercury. No. 1225. 24 October 1834.
^"Fires, Great", in The Insurance Cyclopeadia: Being an Historical Treasury of Events and Circumstances Connected with the Origin and Progress of Insurance, Cornelius Walford, ed. (C. and E. Layton, 1876) pp74-75
^Michael S. Patridge, The Duke of Wellington, 1769-1852: A Bibliography (Greenwood Publishing, 1990) p129
^Rory Muir, Wellington: Waterloo and the Fortunes of Peace 1814-1852 (Yale University Press, 2013) pp439-440