It is never stated,it is unknown whether she even attended Hogwarts.
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Bellatrix Lestrange (nee Black) was in Slytherin house. Every member of the Black family until Sirius was in the Slytherin.
Bellatrix Lestrange, formerly Bellatrix Black, was in Slytherin house along with every other member of the Black family except Sirius Black.
Sybill Trewanlyn.
That is unknown. She may not even have attended Hogwarts.
Rubeus Hagrid was in Gryffindor at Hogwarts School of Witchcraft and Wizardry. Hagrid was in the Gryffindor house.
Slytherin, which was SALAZAR SLYTHERIN'S House. :)
Alastor 'Mad-Eye' Moody's house is currently unknown. However is unlikely that he was in Slytherin because he despised dark arts and everything to do with it. The other three houses all have qualities that could apply to Moody.