Massimo Belcastro was a poor farmer in the Calabria region of Italy. His farm had been suffering when he fortuitously met a beautiful woman (Demeter). The woman never gave her name, but gave to visit and help Massimo on the farm almost every day, and in what seemed to be no time at all, the farm was flourishing and Massimo had a healthy income. Intrigued and smitten with this strange woman, he tried asking her on a date repeatedly and eventually she gave in. A dinner led to a walk in the park, which led to a visit back to the farm, which eventually led to the two in bed. The day after, the woman was gone, leaving a note briefly explaining she was the Greek goddess Demeter. Massimo didn't believe her, and went on with his farming life.
Approximately 9 months later, a baby boy wrapped in a vine green blanket appeared on Massimo's doorstep, attached with a note from Demeter saying he was his son. Massimo was surprised, but took the baby in out of kindness and named him Luka, not completely believing he was his. For five years, they lived on the thriving farm, until Massimo's mother grew sick, and Massimo moved them both to Chicago, America to care for her full time.
Luka grew up tending for his Nonna's garden. He began going to school in America, having difficulties learning English as a second language especially with dyslexia and ADHD. He made few friends, one of which was a satyr who protected Luka throughout his first 7 years in America. When he was 12, a harpy attacked Luka. Luka had been listening to his Ipod up loud, and didn't hear the harpy coming from behind. His satyr friend had been walking behind him and had seen the harpy coming and had defeated it with bow and arrow from his backpack, dying in the process. When Luka didn't see his friend again, he presumed he had moved away.
At around the age of 13, Luka began spending his summers in Italy, on the family farm with his relatives. He began seeing strange things and when was attacked twice by harpies, he had held his hands up in defence and found himself shooting pines from his hands, paralyzing the harpies and allowing him to run to safety in the farmhouse. When he was 15, a hellhound attacked him while he was in Italy. He was lying on his back, with the hellhound on top of him about to rip his head off when a dozen silver arrows appeared in its side. Turning his head to find where the arrows had come from, he saw a line of girls, all dressed in silver, at the edge of the forest near the farm.
One by one, the girls disappeared back into the forest, until only one was left. She declared herself to be a Huntress of Artemis named Isabelle, and had been asked by the goddess to check on Luka, to see if he was ok. It was love at first sight, and Isabelle left the Hunt to be with Luka for the rest of the summer, getting herself an illegal passport when Luka went back to America to be with him.
At the age of 16, Luka realised he was a demigod after Isabelle explained the concept to him. She had wanted to keep it a secret from him, knowing monsters would be less sttracted to him if he didn't know. In the process, she revealed herself to be a daughter of Nyx, and for two years they moved around America, defeating monsters as they came, with Isabelle finding Celestial Broze dual bolos for Luka in a storage facility she knew of. A few weeks short of Luka's 18th birthday, Isabelle and he joined up with a satyr who decided to take them to Camp Half Blood. They agreed, thinking it would a be a great place for their relationship, away from monsters.
On the way there, they encountered a Manticore. The manticore took town the satyr almost immediately, shooting him down with a poison-tipped spike and pouncing on top of him. Isabelle took out her arrows and fired them into the manticore's side, while Luka sprinted to the other side and sliced off one of its wings. The manticore had been enraged, and charged at Isabelle, but she enveloped herself in shadows and escaped the beast's charge. Bit by bit, the two of them chopped the manticore down to size until it was near dead. It was stumbling and fell to the ground, and Isabelle ran and jumped into Luka's arms. Blinded by their supposed success, the couple didn't notice the manticore stand up for a final attack and leap onto Isabelle. She had been surprised, and didn't have time to react as the Manticore bit it's fangs into her neck, killing her. The manticore then slumped, and began to dissolve, leaving a coating of golden dust on Isabelle's dead body.
Luka had knelt at the body and wept for a day, until resolving to go to Camp Half Blood and find a way to avenge Isabelle's death. After a week or so and a harpy attack, Luka arrived at Camp Half Blood, on his 18th birthday.