whereof

[ hwair-uhv, -ov, wair- ]

/ ʰwɛərˈʌv, -ˈɒv, wɛər- /

of what, which, or whom.

Origin of whereof

First recorded in 1150–1200, whereof is from the Middle English word wherof. See where, of¹

All these are natural expressions of innocent gaiety and youthful elasticity of spirits, whereof this world sees far too little.

Glances at Europe |Horace Greeley
Whereof Olaf says that a good leader will act first, and call his council afterwards.

King Olaf's Kinsman |Charles Whistler
For this purpose, a passage was artfully interpolated in the statement of Faukes, whereof no trace is found in the original.

What was the Gunpowder Plot? |John Gerard
The Port Royal “is divided into two great armes, whereof the one runneth toward the west, the other toward the north.”

The Lily and the Totem |William Gilmore Simms

By astragalomancy, whereof I have the plots and models all at hand ready for the purpose.

Gargantua and Pantagruel, Complete. |Francois Rabelais

whereof

/ (wɛərˈɒv) archaic, or formal /

of what or which person or thing?

of which (person or thing) the man whereof I speak is no longer alive