Here is some information about St Philip from Wikipedia:
Born in the Strand, London, he was the eldest son of Thomas Howard, 4th Duke of Norfolk and Lady Mary FitzAlan, daughter of Henry FitzAlan, 19th Earl of Arundel. He was baptized at Whitehall Palace with the Royal Family in attendance, and was named after his godfather, King Philip II of Spain. At the age of fourteen, he was married to his stepsister, Anne Dacre. After years of estrangement, they were reunited and built a very strong marriage.
In 1569, on 1 October, Philip Howard's father, Thomas Howard, was arrested for his intrigues against Queen Elizabeth I. His father was attainted and executed in 1572, but Philip Howard succeeded to his mother's heritage upon the death of his grandfather, becoming Earl of Arundel in 1580.
Howard, and much of his family, remained Catholics during the reign of Queen Elizabeth, when it was very dangerous to do so. They also attempted to leave England without permission. While some might have been able to do this quietly, Howard was second cousin of the Queen. He was committed to the Tower of Londonon 25 April 1585. While charges of high treason were never proved, he spent ten years in the Tower, until his death of dysentery. He had petitioned the Queen as he lay dying to allow him to see his wife and his son, who had been born after his imprisonment. The Queen responded that "If he will but once attend the Protestant Service, he shall not only see his wife and children, but be restored to his honors and estates with every mark of my royal favor." To this, Saint Philip replied, "Tell Her Majesty if my religion be the cause for which I suffer, sorry I am that I have but one life to lose." He refused and died alone in the Tower. He was immediately acclaimed as a Catholic Martyr.
He was buried without ceremony beneath the floor of the church of St Peter ad Vincula, inside the walls of the Tower. Twenty nine years later, his widow and son obtained permission from King James I of England to move the body to the Fitzalan Chapel located on the western grounds of Arundel Castle. His tomb was moved to the Catholic Arundel Cathedral in 1971 and remains a site of pilgrimage.