Intelligence of Stukley's schemes has been building since the intervention of Fitzgibbon.
The spy Oliver King, who had narrowly escaped capture in the Pyrenees by thugs in Stukley’s employ, had in 1572 informed London of invasion plans; Sir William Cecil, Lord Burghley, had in March 1573 received intelligence that certain "decayed gentlemen" were to join Stukley in Spain for the invasion of Ireland.
Walsingham hadn't known what to make of Maurice Fitzgibbon at their first encounter, realizing that an agent of Burghley's had sowed dissension between the archbishop and Stukley; but in 1575, he does have intelligence of Stukley's alliance with Fitzmaurice, at a time when the nuncio at Madrid is urging an invasion of England.
William Byrd, a gifted English musician at the court of Queen Mary, had been eighteen years old when Mary died and the staunchly Protestant Elizabeth succeeded her; the sudden change may well have driven him away from court.
He shows up again in his mid-twenties as organist and choirmaster of Lincoln Cathedral, living at 6 Minster Yard in the cathedral close.
There the clergy apparently had to reprimand him for playing at excessive length during services.
After being named a Gentleman of the Chapel Royal in 1572, a well-paying job with considerable privileges attached to it, Byrd moves back to London where he will work as a singer, composer and organist for more than two decades.
He and his teacher Thomas Tallis had obtained a joint printing license from Queen Elizabeth just after his appointment.
Byrd and Tallis compose a collections of Latin motets or Cantiones Sacrae, publishing them in 1575.