Biographers believe that Bacon was educated at home in his early years owing to poor health, which would plague him throughout his life. He received tuition from John Walsall, a graduate of Oxford with a strong leaning toward Puritanism. He went up to Trinity College at the University of Cambridge on 5 April 1573 at the age of 12, living for three years there, together with his older brother Anthony Bacon under the personal tutelage of Dr John Whitgift, future Archbishop of Canterbury. Bacon's education was conducted largely in Latin and followed the medieval curriculum. It was at Cambridge that Bacon first met Queen Elizabeth, who was impressed by his precocious intellect, and was accustomed to calling him "The young lord keeper".