Without searching, can you name a historic event before the year 1000?

681AD, the formation of Bulgaria.

The fall of the Roman Empire

The rise of Christianity

Egyptian or Roman empires? Anything from Greek philosophy?

731 AD, Champa (modern day Vietnam) princeling Nandivarman becomes the Pallava Emperor and is crowned at Kanchipuram, modern day Tamil Nadu, India.

TBF, I remember this only because I have been reading D Dennis Hudson’s work.

The first one that comes to mind, as there are many, is the eruption of Mount Vesuvius in 79 A.D.

The second would be the assassination of Caesar on the Ides of March 44 B.C.

Crucifixion of Jesus Christ in 30 A.D.

Battle of Thermopylae, 480 B.C.

The sacking of Rome by the Goths in 410

I seem to have a good memory for the dates of birth/death of historical figures, or at least approximately when they lived. Not always exactly. It seems to be rounded to roughly within 10 - 20 years. Off the top of my head: Confucius died around 450 BC, Alexander in 323 BC, Ramesses the Great fl. c. 1300 BC. Pacal the Great died 680 AD, Plato died 350 BC, Lucretius 50 BC, Lucian just before 200 AD, and Belisarius was fighting the Gothic War c. 540 AD.

I'd point out that we often don't know the exact historical date, that far back. For example, no one knows the alignment of the ancient Mesopotamian calendars with our own. So we know the exact Assyrian date of when Sargon II fell in battle during his last campaign, but it's a bit of guess as to what date in our calendar that was. Probably around 700 BC.