The Festal Letters of Athanasius is a book that was discovered in an ancient Syriac version in 1848. It is a collection of letters written by Athanasius, a prominent Christian theologian and bishop of Alexandria in the 4th century. These letters were written to the churches in his diocese, and they provide guidance and instruction on how to celebrate the various festivals and holy days of the Christian calendar. The book is divided into 12 chapters,...