The headmistress in Roald Dahl's "Matilda" is Miss Trunchbull.
Yes, head mistress the correct grammar. However it can be completed by placing something before or after.
Jill Horsburgh
1939
Camilla Fritton
I dont know but it could be the head mistress of Beaxubatons.
The line is, "If hairs be wires, black wires grow on her head."
Cleopatra VII was a pharaoh of Egypt. She also was the mistress of Julius Caesar, head of Rome.
I have only heard head mistress used as a fancy-Dan ( or danielle) synonym for a Principal of a school, usually all-girls. Headmaster is far more common. Headmasters usually teach as well as serve as adminstrators. I have never heard head Mistress as some sort of rank-title for a concubine in chief, as you make it out. Concubine is the fancy Dan term for (Mistress) in the sense of unmarried lover) Charlemagne had several, it would appear the King had a distrust of conventional marriage bonds. Concubines are discussed in the Bible. When I was a kid I thought they were pets akin to say, porcupines.
The Mistress mafiozo is called Goomah (it is sometimes said as "goomar")
They are the minions of the head Mistress whats her name. Anyway they aren't really a key roll but still important since they tricked the head mistress person. Glad I could help sorry if you don't understand.
The single possessive form of "mistress" is "mistress's." This form indicates that something belongs to or is associated with one mistress. For example, you might say, "The mistress's house is beautiful."
The abbreviation of Mistress is Mrs.