Biografie: Sienna Tiggy Guillory is an English actress and former model. She portrayed Jill Valentine in the Resident Evil action-horror film franchise. Her other prominent roles include elf princess Arya Dröttningu in the fantasy-adventure film Eragon, and the title role in the TV miniseries Helen of Troy. She is the daughter of American folk guitarist Isaac Guillory and Tina Thompson, an English model.