Windows 7 on a Pentium II?
This has nothing to do with Virtualization but it's fun to look at anyway. This forum had a user who loaded Windows 7 on his Pentium II 266 with 128MB of RAM. Maybe we could replicate this in a VM?
https://forum.thewindowsclub.com/windows-hardware-devices/28053-windows-7-dinosaur.html#post135619