The saints are from left to right: Mark, Peter Martyr, Thomas Aquinas, Dominic, Luke; & to the right of the figures of the Virgin & Child: John the Evangelist, Gregory, Catherine of Alexandria, the Magdalen, & a bishop with a book (perhaps Thomas à Becket). The painting is associated with the Dominican Church of S. Maria Novella in Florence because of the artist's links with this church & the choice of saints, some of whom are Dominican, & all of whom had altars dedicated to them in the church.