Baby's P's natural father, who cannot be named for legal reasons, said: "P was a bouncing 17-month-old boy.
All ancient people worshipped the sun and thought that a day should be named for it.
Charged with murder - the boy's mother and her boyfriend, neither of whom can be named for legal reasons, and a second man, Jason Owen, who was a lodger in the house.
The professor, who teaches Web security, asked not to be named for fear of reprisal.
