Tom Marvolo Riddle was the son of Tom Riddle Sr. and Merope Gaunt. Tom Riddle was not concieved in a loving marriage as Riddle was enchanted by Gaunt into loving her. Riddle was freed of the enchantment and abandoned Gaunt. Gaunt died in childbirth naming her son Tom Marvolo Riddle.
Tom Riddle grew up in an orphanage and was greatly unpopular with both the orphans and the staff. Riddle quickly used his magical talents to control, steal and hurt his fellow orphans.
Eventually Tom was greeted by Professor Albus Dumbledore who invited him to join Hogwarts. Tom eventually began his life as a wizard, excelling in his studies and charming many of the teachers. Riddle learned of his family's history, hating his non-magical family and dismissing his immediate family he found kinship only with being the blood heir of Salazar Slytherin.
Graduating Riddle became a teacher of Defense against the Dark Arts in Hogwarts.
While touring London in 1969 Tom met Mina Murray in the Purple Orchestra's Concert in Hyde Park in honor of the death of Basil Thomas. Tom sexually assaults a passed out Mina but became possesed by Oliver Haddo. Haddo used Riddle's body and left for Hogwarts.
Sometime later, in the late 90s, he ascended to the administration at Hogwart's and used his position to cultivate one of the students to become the Antichrist. When the student learned that he was being manipulated, he went on a rampage, destroying the school and slaughtering everyone within until someone pointed him towards Riddle. After Riddle confessed everything, the boy ripped his head off and then spent the next decade or so hiding out in a small flat in London, desperately trying to put off his fate.
Tom Riddle is known popularly as Lord Voldemort in JK Rowling's Harry Potter series.
The Tom Riddle from the LoEG-media greatly differs from the source material. In the original novels he is the most powerful Dark Wizard ever, and has nothing but contempt for the non-magical humans, even before his rise to power. Tom Riddle also refuses to be referred to as anything other than "Lord Voldemort". He never becomes a Professor at Hogwarts despite trying several times.