As quoted from his page on THIS website:
"Laurent was born in the early 1700s in Paris, France, into an aristocratic but financially embarrassed family during the reign of King Louis XIV. He was the third son, and had little in the way of prospects. Laurent was recommended for a minor position in the court of the Sun King by his older brother, who married into a more prosperous family. Laurent loved being a part of the court and had ambitions to rise. He was always attracted to people with power, and curried their favor. He had a knack for discerning who the most important person was in any given grouping, and then attaching himself to that person. There was a certain way about Laurent that made anyone he singled out feel more important. Therefore, he did well among the other aristocrats and had a promising future. His life changed when a mysterious ambassador named Boris, purportedly from the Romanov court in Russia, made a diplomatic visit to the French court. The ambassador's strange behavior was attributed to cultural differences. He came out of his quarters only at night, kept a retinue of mute servants and soldiers who were totally obedient, and always put off discussions of matters of state. He did seem to enjoy the entertainments of the French court immensely and was very interested in King Louis's art collection.
Laurent was drawn to the powerful Boris and befriended him. When the mysterious disappearances of men and women began to attract notice, the ambassador had to move on. Before he did, he offered Laurent the opportunity to go with him, which he accepted out of his thirst for power. Eventually, Boris told him the truth about himself, and Laurent begged him to share his power and immortality, and he complied.
Boris became his companion for awhile, until Laurent grew tired of his creator's jovial habits and left him to find someone with more power. He ran into one of the surviving Romanians, Vladimir, who still radiated some of the power he had once held. However, he did not stay for long as he next turned to the Volturi, who held the exact kind of power that he sought. However, Aro turned him away after finding out that he had encountered the Romanians and declared him as untrustworthy. He continued to hope that he would get another chance to join the Volturi, though the chance was never offered. He wandered the world, allying with anyone who seemed to have power until he found someone more powerful. Eventually, he joined joined James's coven. The three of them once tracked down a werewolf across Siberia. They then went to the US, becoming nomads."