Rosanna Calvierri was the alias used by the matriarch of a group of Saturnynians fleeing from a crack in time.
Biography
Rosanna and her children fled to Venice where she and her eldest son, Francesco, used Perception filters to appear human. They had come to the Italian city because of their marine nature and to exploit the fear of the plague. They set up a "school" under her management. It gained fame in the city as a plague-free haven and became fashionable.
Once the girls wer
e in the schools, their blood would be replaced with that of the Saturnyians, and they would be transformed into females of the species, ready to help drown Venice and form a new race with the other male survivors. The Eleventh Doctor disabled her machinery leaving her plans in tatters. With no hope of rebuilding her species and her perception filter broken, Rosanna was stuck in human form. She threw herself into the canal and was devoured by her children because they could not recognise her and thought she was a meal.When the Doctor got ready to go to the Tardis he heard Rosanas voice as if she was still alive, (DW: The Vampires of Venice)
Rosana although she did not fight in the episode looked liked her teeth were lethal and that she was a good swimmer like any Satrnyians. She also looked prety strong. She looked like she could rip a person to peices with them terrible claws of hers.
Behind the scenes
- Rosanna's school is likely a reference to "the blood countess" Elizabeth Báthory who used the same trick to feed her blood lust.