This is a list of selected September 28 anniversaries that appear in the "On this day" section of the Main Page. To suggest a new item, in most cases, you can be bold and edit this page. Before doing so, please review the selected anniversaries guidelines. If your suggestion is potentially controversial or relates to a day currently or soon to appear on the Main Page, post it on the talk page instead.
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September 28: St. Wenceslas Day in the Czech Republic; Teacher's Day in Taiwan
- 48 BC – Pompey the Great was assassinated on orders of King Ptolemy of Egypt after landing in Egypt following a decisive defeat by Julius Caesar at the Battle of Pharsalus.
- 1066 – William the Conqueror and his fleet of around 600 ships landed at Pevensey, Sussex, beginning the Norman conquest of England.
- 1708 – Great Northern War: Russia defeated Sweden at the Battle of Lesnaya on the Russian–Polish border in present-day Belarus.
- 1928 – Scottish biologist and pharmacologist Alexander Fleming (pictured) noticed a bacteria-killing mold growing in his laboratory, discovering what became known as penicillin.
- 1978 – Pope John Paul I died only 33 days after his papal election due to an apparent myocardial infarction, an event that has spawned a variety of murder conspiracy theories.
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