Ariel de Farnese

Present head of the noble Farnese family. She has Juliet and her entourage sheltered in the theater owned by her son, William. She is also an old friend of Conrad's and one of the few who know Juliet's secret. She offers her home in Mantua as a sanctuary for Juliet, Curio, Francisco, and Antonio after Juliet is rescued from Montague, where they are attended by Ariel's butler, Balthazar, and his granddaughter, Regan. Her name may be a reference to the sprite from the Tempest, who acts as the eyes and ears for one of the main characters.

(Source: Wikipedia)