The Book of One Hundred Chapters, also called Stoglav (Стоглав) in Russian ("Hundred chapters"), is a collection of decisions of the Russian church council of 1551 that regulated the canon law and ecclesiastical life in the Tsardom of Russia, especially the everyday life of the Russian clergy. The book is shaped in the form of answers to some 100 questions posed by Ivan IV of Russia. A constant theme running through the chapters is the Byzantine symphonia (harmony) between the 'priesthood' and the 'kingdom'.