Cardinal virtues
Augustine of Hippo, discussing the morals of the church, described them:
The "cardinal" virtues are not the same as the three theological virtues: Faith, Hope and Charity (Love), named in 1 Corinthians 13. 
"And now these three remain: faith, hope and love. But the greatest of these is love."
Because of this reference, a group of seven attributes is sometimes listed by adding the four cardinal virtues (prudence, temperance, fortitude, justice) and three theological virtues (faith, hope, charity).
Together, they comprise what is known as the seven virtues. While the first four date back to Greek philosophers and were applicable to all people seeking to live moral lives, the "theological virtues" appear to be specific to Christians as written by Paul in The New Testament.
The Faerie Queene
In addition to the six virtues Holiness, Temperance, Chastity, Friendship, Justice, and Courtesy, the Letter to Raleigh suggests that Arthur represents the virtue of Magnificence, which ("according to Aristotle and the rest") is "the perfection of all the rest, and containeth in it them all"; and that the Faerie Queene herself represents Glory (hence her name, Gloriana). The unfinished seventh book (the Cantos of Mutability) appears to have represented the virtue of "constancy."