Background
Born 52 BBY on Naboo as an aristocrat with somewhat strong ties with the Royal House of Naboo. During early adulthood Patrus received training at the Republic Military Academy prior to the clone wars, however, at the same time he began to develop a slight animosity towards the Senate and its policies.
At the age of 20, he was assigned to Naboo during the blockade and eventual invasion, he was dissatisfied with how the Republic dealt with the situation and its strong reliance on the Jedi and native population instead of using its own strength. However, he remained loyal until the Battle of Geonosis (22 BBY) where he saw the replacement of many officers with clones.
Not trusting clones and becoming utterly disillusioned with the republic he went into exile to join the CIS loathing the corporate backing but loving the idea of an independent Naboo. He was immediately enlisted as a strategic advisor and officer taking part in battles such as Duro and Cerea. Following the fall of the CIS and Darth Vader's purge on Mustafar, he knew he would be a target as he held some political influence amongst the Separatists and went into exile again.
Motivation
To free Naboo from the claws of tyranny and destroy the Empire.