Excerpts from Books and Wikipedia
"Louis Napoléon Bonaparte (…) was a younger brother of Napoleon I, Emperor of the French. 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 . . . Louis followed his older brothers into the French Army, where he benefited from Napoleon's patronage. In 1802, he married his step-niece Hortense de Beauharnais, the daughter of Empress Joséphine (Napoleon's wife). In 1806, Napoleon established the Kingdom of Holland in place of the Batavian Republic, appointing Louis as the new king. 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 willfulness, Napoleon annexed Holland into the French Empire in 1810. Louis fled into exile in Austria, where he spent the rest of his life. His son Louis-Napoléon established the Second French Empire, taking the throne as Napoleon III." [Wikipedia]