He was a monarch in his own right from 1806 to 1810, ruling over the Kingdom of Holland (a French client state roughly corresponding to the current Netherlands).
In that capacity he was known as Louis I (Dutch: Lodewijk I; Dutch pronunciation: ['lo?d???ik]).
Louis was the fifth surviving child and fourth surviving son of Carlo Buonaparte and Letizia Ramolino, out of eight children who lived past infancy.
He and his siblings were all born on Corsica, which had been conquered by France less than a decade before his birth.
Louis followed his older brothers into the French Army, where he benefited from Napoleon's patronage.
Napoleon had intended for Holland to be little more than a puppet state, but Louis was determined to be as independent as possible, and in fact became quite popular amongst his new people.
Growing tired of his brother's wilfulness, Napoleon annexed Holland into the French Empire in 1810.
Louis fled into exile in Austria, where he spent the rest of his life.