From her earliest years, Catherine of Siena (1347-80) was griped by the mystery of od incarnate. This was the beginning of a life-long love story, a life-long conversion in which Christ spoke to Catherine and she communicated the truth of his being to the world of her time. Creation itself, she says, is an act of love, and Christ is the bridge by which human beings come to realise their full humanity, their inmost nature, which is to love. Mystic, champion of the poor and Church reformer, Catherine was declared a Doctor of the Church in 1970. She was unable to write until she was thrity, but she corresponded with Popes, Cardinals, Scholars and civic authorities. She was a true daughter of the fourteenth century, famous in her own life time, and yet her thinking and her work seem entirely relevant in the political and ecclesial context of our own time.