Background
During the waning days of the Clone Wars, Darothy LaCroix had been a determined anthropologist, fascinated with the reclusive Jedi and obsessed with recording and preserving as much about their order as she could, especially when it came to their iconic art, lightsaber combat. After witnessing a Jedi Knight in action as a war reporter, it was love at first sight, and she dedicated her life to creating one of the most complete compendiums regarding lightsaber combat ever made by a non force sensitive civilian, going as far as to trespass on Jedi Temple grounds in hopes of observing a Padawan performing a cadence.
Now, with the rise of the Empire, she is merely one of many public scholars stiffled by the Empire, paid well to spread lies about who the Jedi were, and what they did. Her son Lancaster is one of the few fortunate enough to know something resembling the truth, and while his mother knew very little about their religion, he inherited her adoration for the Jedi's swordsmanship, passed down through a childhood of stories.
As he aged and matured, Lancaster grew from sparring neighborhood children with sticks, to fully fledged amateur archaeological pursuits of his own. He purchased a museum replica of an ancient sword from a curio trader, who clamed it was modeled after one the Jedi used to wield, long before they had lightsabers.
Still, one cannot dig into the Jedi's arts without attracting Imperial attention, especially not on Coruscant. But strangely enough, the Imperial who spoke to Lancaster appeared sympathetic, especially after hearing his story, and in a uncharacteristic display of mercy, let him go free - wishing him luck on his quest.
Thus, with some basic equipment, and armed with a replica, Lancaster boarded a ship and left Coruscant, eager to hone his skills and breathe new life into a forgotten art form.
Motivation
Martial Mastery: Master the art of fighting with a lightsaber, by learning whenever he can, developing his own style, and testing his skills whenever possible.
Artistic Legacy: To Lancaster, the greatest tragedy to come from the extinction of the Jedi is the loss of their art - lightsaber combat. While he has never taken any official vows or formal oaths, he knows that keeping this dying art form alive is his life's purpose, just as it was his mother's.