In 1604 Fawkes became involved with a small group of English Catholics, led by Robert Catesby, who planned to assassinate the Protestant King James and replace him with his daughter, third in the line of succession, Princess Elizabeth. Fawkes was described by the Jesuit priest and former school friend Oswald Tesimond as "pleasant of approach and cheerful of manner, opposed to quarrels and strife ... loyal to his friends". Tesimond also claimed Fawkes was "a man highly skilled in matters of war", and that it was this mixture of piety and professionalism that endeared him to his fellow conspirators. The author Antonia Fraser describes Fawkes as "a tall, powerfully built man, with thick reddish-brown hair, a flowing moustache in the tradition of the time, and a bushy reddish-brown beard", and that he was "a man of action ... capable of intelligent argument as well as physical endurance, somewhat to the surprise of his enemies."