First published in 1622, Jeremias Drexel's 'Zodiacus christianus' (or 'Christian Zodiac') was a remarkable work of religious iconography and spiritual self-help. Raised a Lutheran but converting to Catholicism in his youth, Drexel (1581-1638) was well placed to publish a book that appealed to Protestants as well as Catholics, his 'Zodiac' appearing in multiple reprints, re-editions and translations across Europe during his lifetime and posthumously across the rest of the seventeenth century in an astonishing arc of popularity. The orbit of his readers' catchment was geographically - and...