The Gray Lady????

[zephyr036]

No: HPFGUIDX 30969

   Okay gang, I am going to toss this question out to see if anyone 
can answer. I recently heard that JK based one of the Hogwarts ghosts 
on the legend of the UK's "Gray Lady" ghost. I have been through all 
four books, several times, and have not found any reference to 
the "Gray Lady" or even a female ghost at Hogwarts. I am wondering, 
however, if the "Gray Lady" is not, in fact, the house ghost for 
Ravenclaw. I know that Gryffindor's house ghost is "Nearly Headless 
Nick", Slytherin's is "The Bloody Baron" and Hufflepuff's (my own 
house) is "The Fat Friar", but I have yet to find any reference to 
the Ravenclaw ghost. Furthermore, does anyone know which faculty 
member is the head of the house for Ravenclaw? Perhaps, Prof. 
Flitwick??