Astolfo is English though. But then again, he might have picked up a few things from his Frankish friends =w=
He is a character originating from a fiction titled "Matter of France", and seems to follow French culture over his birth background. Or at least in the context of this story.
MARIE ANTOINETTE!Ah, it's been a while!How have you been?I didn't know the proper French greeting until now.I'll make sure to do it properly from now on.The one who's been spreading a strange French yuri gesture was----you, wasnt it?!That's right.