Henry Bullinger’s Decades was a collection of theological addresses arranged into five groups of ten, hence the name. The best known of Bullinger’s works, it provides a sweeping survey of Christian faith and life, and outsold Calvin’s Institutes when first published in England. Why was it so popular? How well has it stood the test of time? What can we learn today from this prolific Swiss theologian and his ministry? Florian Weicken will introduce us to the man and to his book, and help us to understand its enduring significance and value.