In the late 20th century, Angel, as he began calling himself, became an ally and lover (who he still deeply loves) of the current Slayer, Buffy Summers.
After the two were forced to realize their limitations as a couple, Angel left Buffy and moved to Los Angeles, where he became a Champion of the Powers That Be and dedicated himself to "helping the helpless" in the hope of achieving atonement.
After being kicked out of the bar for fighting, he followed the woman—the vampire, Darla—into an alleyway, where she promised to show him a whole new world, and then sired him.
He was later described in historical volumes as the "one with the angelic face", and the "demon with the face of an angel." After leaving Ireland behind, Angelus and Darla cut a bloody swath through Wales and Northern England before reaching London in 1760.
During Angelus' first meeting with Darla's sire, The Master, he openly mocked the older vampire, and showed no fear despite the Master's greater age, power and authority.
Liam's body was buried; at some point during the night, he rose again, and in response to Darla's assertion, set about slaughtering his entire village.
First, he brutally massacred his own family, whose blood he later described as the "sweetest of all." Believing her brother had returned to her as an angel, Liam's little sister, Kathy, ignorantly invited him inside the family home. As he killed his father, Liam boasted that despite his father's disapproval, he had managed to make something of himself after all.
Eventually, Angel adopted the identity of Twilight and gathered a cabal of humans and demons who had become wary of the rise of multiple Slayers.
As Twilight, Angel sought to keep these forces distracted as well as make Buffy grow more focused and stronger, and at the same time, try to keep the Slayers' deaths as low as he could.
At the age of eighteen, Liam had a failed relationship with an aristocrat named Sarah Gilfried.
As a result, he became disillusioned with the women of his era, and showed distaste for noblewomen in particular, describing them as "incredibly dull, simpering morons." Above all, he sought to meet someone "exciting" and "interesting." By his twenties, Liam had become a drunken, whoring layabout, whose only real ambition in life lay in someday seeing the world.
Angel was one of the most well-known vampires in all of vampiric history, legendary for both his savage villainy and his great heroism.