Elias Lightwood, a demigod son of Circe, rose to prominence in the late 19th Century and was known as a great practitioner of magic. He had apprentices, and followers that would do his bidding, and he was able to establish a well-known coven in Brooklyn, New York City, made up of some of his siblings as well as others who are well-versed with magic. Because of this, Elias attracted the attention of Hecate - the titan goddess of magic - and together, they sired a baby boy, a son to Elias and his heir apparent. As a demigod himself, he knew of the rules, of why Hecate had to leave. And so, he was left to raising their son - whom he named Edward - on his own, and that's where actually poured all of his time and effort to in the subsequent years after his son's birth.
Edward grew up well loved and well trained in his abilities as a sorcerer. One of Elias' closest associates, Andorra Ramirez - who is also a daughter of Hecate - was tasked with keeping him safe at all times as well as overlooking all of Edward's lessons with the other masters of magic in the coven. As a result, they grew close, and had a really tight brother-sister bond. Andorra was also the one who made sure that no monsters would hurt Edward, and took care of the common harpies and hellhounds that dared to get close to them.
When Edward turned seventeen, he fell in love with a daughter of Hebe, Alisa, whose father also worked for Elias' coven. They had an instant connection, and they formed a strong relationship with one another, however, a lot of other women were jealous of Alisa, because she was dating the heir of the coven, and they all wanted their own share of power. Because of this, a young daughter of Aphrodite, Isabella, schemed with her mortal mother and made a love potion that they would slip in Edward's drink in order to effectively gain his affections.
The plan was set to full motion two years into Edward and Alisa's relationship, with the former being nineteen years old and the latter, a year younger. Isabella poured the contents of the love potion into Edward's tea when he wasn't looking, and surprised him with a kiss that would activate its effects. It worked, and Edward was suddenly hit with the desire to be with Isabella and to copulate with her. They were caught by Alisa, who was devastated and ran out the room and into the massive halls of the coven's mansion. At the same time, a hydra and a drakon - attracted by the very large amount of demigods concentrated in one area - showed up and wreaked havoc in the coven. Because of the monsters' behemoth-like strength, the coven members couldn't defend themselves, and the mansion was effectively obliterated. Edward was able to escape with Andorra and Isabella, and he wanted to save Alisa, but it was already too late and she was burned to death by the Hydra's fire. Among the casualties was Edward's father, Elias, who died at the hands of the drakon, and with nothing left of their former home, the coven was completely erased from the face of the earth.
Hebe, the godly parent of Alisa, wasn't very pleased with her daughter's fate and assigned blame onto Isabella and Edward. One night, she revealed herself to them, and out of her anger, she transformed the daughter of Aphrodite into a tree - deeming her as someone who doesn't deserve to live anymore, but because she doesn't want to get in trouble with Aphrodite, decided that it's better to just turn her into something inanimate rather than to take her life away. As for Edward's punishment, she cursed him to never age and become eternally young, so that no matter who he falls in love with, they would all grow old and he'd have to watch them die.
After that encounter, Andorra and Edward decided to move on with their lives. Edward was still devastated of his father's death, but he knows that he needs to move on eventually. And that, he did. He travelled the world with Andorra and fought against monsters and other demigods. They got into a skirmish with European sons of Ares when they visited Germany, and they engaged in combat. The Europeans were obliterated, but not before they mortally wounded Andorra. Edward was devastated yet again, but before Andorra completely, she was saved by Artemis and turned her into one of her Hunters. Edward knew they had to part ways after that, but he was still grateful to the goddess of the Hunt for saving Andorra's life.
Life went on for Edward. He was caught in the crossfires of World War II but survived, and later on found himself involved in the Korean and Vietnamese wars - both of which he also survived. By 1990, he had traveled almost all of the world, except some locations in Africa and South America, and once again, he found himself fighting in another war - this time the Yugoslav wars. When that ended, Edward continued his travels and by 2016, he was proud to have already seen the whole world - effectively turning his "curse" into somewhat of a blessing, and Hebe was pissed, sure, but Hecate made sure that she will no longer do anything that could possibly jeopardize her son again.
By 2017, without nothing much to do anymore, and having already grown weary of all the traveling around, Edward decided to go back close to home, and to settle in Camp Half-Blood in Long Island, New York. He wanted to connect with his other half-siblings, and perhaps to train his powers more. And so, the moment he set foot in Camp's borders, he was immediately claimed by his mother, Hecate.