 Fitzmaurice had more success though, at the court of Pope Gregory XIII, where he met with exiled English Roman Catholic priests such as William Allen and Nicholas Sanders who were seeking to invade England, depose Elizabeth and restore a Catholic monarchy.With the English adventurer Captain Thomas Stukley, Fitzmaurice planned an expedition which was to make Giacomo Boncompagni, the nephew of Pope Gregory, King of Ireland.This was supported by the English Catholics.