Final answer:
The text does not provide direct information regarding the name of Caligula's Dutch bodyguard; instead, it offers details about Caligula's reign, his eccentricities, and key figures associated with him.
Step-by-step explanation:
The name of Caligula's Dutch bodyguard is not specifically listed in the provided information. The historical figures mentioned are: Cassius Chaerea, who was indeed a member of the Praetorian Guard and known for his role in Caligula's assassination; Macro, who was the previous head of the Praetorian Guard and played a role in helping Caligula become emperor; Gemellus, who was Caligula's cousin and co-heir before being executed by Caligula. Longinus is not mentioned in the excerpts, so there is no specific context to associate him with a Dutch bodyguard role. The historical context backgrounds Caligula's reign and some of his questionable actions, like his attachment to the Green faction of chariot racing, his extravagant treatment of his horse Incitatus, and his overall erratic behavior. Additionally, we get glimpses into his familial connections and the political environment of the Roman Empire at the time.