Short answers, pulled from the story.
Brienne-le-Château is known as the seat of the medieval County of Brienne, whose lords held claims to the Kingdom of Jerusalem, and as the location of the École de Brienne military school where Napoleon Bonaparte studied from 1779 to 1784. It was also the site of the Battle of Brienne in 1814, when the Sixth Coalition invaded France.
Yes. Napoleon Bonaparte attended the École de Brienne from 1779 to 1784, years before he became French Emperor. The school was established in 1730 and closed in 1790; it is now a museum.
John of Brienne, also known as John I, was born around 1170 as the youngest son of Erard II, a wealthy nobleman in Champagne. He was King of Jerusalem from 1210 to 1225 and later Latin Emperor of Constantinople from 1229 until his death on the 27th of March 1237. His claim derived from the medieval County of Brienne.
The Battle of Brienne took place in 1814 when the Sixth Coalition invaded France and engaged French forces at Brienne-le-Château. The town lies about one mile from the river Aube and twenty-six miles northeast of Troyes, making it an accessible position for advancing coalition armies.
Brienne-le-Château is a commune in the Aube department in north-central France. It sits one mile from the right bank of the river Aube and twenty-six miles northeast of Troyes, in the Grand Est region.
Louis-Nicolas Davout, who became a French Marshal, was among the notable students at the École de Brienne. Another notable alumnus was Antoine Le Picard de Phélippeaux, who became known as a French emigre soldier.