Welcome to Harry Potter Theory. Today we're discussing notorious werewolf Fenrir Greyback- digging in to his past and uncovering some things that you may have never known.

Believe it or not, once upon a time, Fenrir Greyback was just a regular wizard. He didn't have sharp teeth, long yellow nails, whiskers, or hair sprouting from every part of his body. He also didn't transform in to a horrible, dangerous magical creature when a full moon filled the sky.

There is speculation out there pertaining to whether or not Greyback was ever a wizard at all. But as it happens, Rowling has confirmed that ONLY wizards are able to transform in to werewolves after being bitten by one, and that muggles simply die. This (if it wasn't clear already) confirms the fact that Greyback was indeed a wizard.

In fact, though information on him is sparse, the available evidence would suggest that Greyback was perhaps even once a student at Hogwarts just like Harry, Ron and Hermione. This fact would explain his magical skills, his connections within the Death Eaters, and his hatred of 'normal wizards'.

But on one fateful day, presumably after his wizarding education had finished, wizard Greyback (who likely was already of dubious morality) had an encounter with a werewolf where he was bitten.

At this moment Fenrir was infected with Lycanthropy by the un-named werewolf, a magical affliction that transforms witches and wizards in to werewolves. One who is infected with Lycanthropy is henceforth known as a 'Lycanthrope'.

There are two ways to become a Lycanthrope, but regardless of HOW it is contracted, it is still considered to be a curse (for which there is no cure) that will completely alter the victims existence.

The first (and most common) way to contract Lycanthropy is through being bitten by a werewolf, though in some circumstances the bite can/will kill you. You must also be bitten by a werewolf in their wolfish form at the time of the full moon- ensuring that the werewolf's saliva mingles with the victim's blo*od.

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