October 17 – Erik XII proclaims himself king of Sweden, in opposition to his father, King Magnus IV. Thus begins a civil war in Sweden between father and son, which will last until Erik's death in 1359.[4]
October 18 (St Luke's Day) – The Basel earthquake affects northern Switzerland, with a maximum MSK intensity of IX–X (Destructive–Devastating), leaving around 1,000 dead. It is the most damaging intraplate earthquake known to have occurred in central Europe.[5]
^Hammond, Matthew (2019). "The Acts of Edward Balliol, king of Scots (1332–56)". The community of the realm in Scotland, 1249–1424. Retrieved June 15, 2023.
^Oskar Halecki; W: F. Reddaway; J. H. Penson. The Law of Magdeburg used in Poland. The Cambridge History of Poland. CUP (Cambridge University Press) Archive. pp. 133–136. ISBN1-001-28802-5. Retrieved June 16, 2023.
^"Erik Magnusson". Svenskt biografiskt lexikon. Retrieved June 15, 2023.
^1356 Basel Earthquake: A 650-Year Retrospective" (PDF). Risk Management Solutions. 2006. Archived from the original (PDF) on 29 February 2012. Retrieved 16 June 2023. The most damaging intraplate earthquake known to have occurred in central Europe.
^Luxembourg, Charles IV (2 November 2019). The Golden Bull of 1356 AD. ISBN978-1-9870-2740-2
^Lindström, Dag. 1991. Skrå, stad och stat. Stockholm, Malmö och Bergen ca 1350-1622. Acta Universitatis Upsaliensis: Uppsala.
Ebrey, Patricia Buckley, 1947-. - The Cambridge illustrated history of China / Patricia Buckley Ebrey.. - 2023 - Third edition.. - ISBN978-1-009-15142-9
Hammond, Matthew (2019). "The Acts of Edward Balliol, king of Scots (1332–56)". The community of the realm in Scotland, 1249–1424. Retrieved June 15, 2023.
McKisack, May (31 December 1959). The Fourteenth Century 1307–1399. Oxford History of England. Vol. 5. Oxford: Clarendon Press. ISBN978-0-19-821712-1OL26141653M.