The Prague Cemetery Chapter 5
Simonino the Carbonaro
"The Carbonari were groups of secret revolutionary societies founded in early 19th-century Italy... Members of the Carbonari, and those influenced by them did take part in important events in the process of Italian Unification (often referred to as the Risorgimento), especially the Revolution of 1820, and in the further development of Italian nationalism." Wikipedia
a township in Piedmont. Wikipedia Could it be some relation to Abbé Dalla Piccola? Or perhaps it simply distinguishes it from nearby "Odalengo Grande." [See note on Dallapiccolo in chapter 2.]
lavish restaurants as Il Cambio
Established in 1711 as a cafe, the restaurant still serves lavish dishes in splendid surroundings. 
In Il Cambio Simonino was initiated "into the mysteries of finanziera...To enjoy this dish properly one had to dress, as the name suggested, in a frock coat, or stiffelius, as it was otherwise called." Finanziera means "financier", and the suggested clothing looks something like this: 
Tried to instigate an uprising by liberating prisoners and using them as foot-soldiers. Stabbed to death by angry locals who thought he was a gypsy trying to steal food.  He is the Government Agent's epitome of a confused and potentially dangerous young man who needs to be arrested for his own good.
The Alta Vendita was the leading council of the Carbonari. Members of separate districts formed a vendita, and selected delegates to the Alta Vendita. The name also refers to "The Permanent Instruction of the Alta Vendita", a document, originally published in Italian in the 19th century, purportedly produced by the highest lodge of the Italian Carbonari. The document details an alleged Masonic plan to infiltrate the Catholic Church and spread liberal ideas within it." Wikipedia
Reminiscent of the Protocols.
Their leader was Nubius...
The leaders of the Carbonari used pseudonyms.
Nubius remained at the helm of the highest Vendita until 1844, when someone poisoned him with Aqua Tofana.
Aqua Tofana was an effective locally produced poison that was usually used by wives to kill their husbands.