I have several

First a vague one. My 3rd great-grandmother was a Copley. The Copley family was rather important in Nottinghamshire and Lincolnshire. They married into lots of noble families and families of estate owners. The eldest known member of the Copley family came to England in 1066 with William the Conqueror.
Then there is my 4th great-grandmother. She was Mary Ann Gibson. Her brother, Stuart Gibson, had two sons (well, he had more, but only two matter here). The first was William Gibson. He was in the navy and fought in the battle of Zhenjiang in 1842. After some years catching pirates in Borneo, he volunteered to participate in the ill-fated North Pole expedition of John Franklin. He never returned...
In a letter to his daughter who remained in england, Stuart Gibson wrote about his youngest son Alfred that he didn't know what to do with him and that Alf was too lazy and weak to find a decent job. Probably to proove himself to his dad, he enlisted in an expedition with Ernest Giles to cross the Western Australian desert. He never returned, and the part of the desert where he was lost is now called "Gibson desert".
Must have been hard for Stuart, having two sons disappear on opposite sides of the world...
Lastly there is the uncle of my 4th great-aunt (who was at the same time brother-in-law to the sister of the aforementioned Mary Ann Gibson), Andrew Pattison Carlisle.
He served as a Lieutenant in the 54th Regiment of Foot during the Battle of Waterloo. If I read the history of that regiment correctly, they were stationed in a town at about 15km from Waterloo. When they arrived at the site, the battle was over.
He later became Captain at the 91st regiment of Foot, the Argyll Highlanders.
His death is quite awfull too. Suffering from rheumatism, he commited suicide in 1834. According to the news paper he had slit his own throat with a razor blade, and when he didn't die fast enough, he severed his artery with a pen. Several people in the medical domain have confirmed that this is highly unlikely. His son was found outside with a bottle of liquor. He claimed to be on his way to his father, but chances are that he was actually just leaving the house after murdering him...