Kings and rulers (Topical Term)
- Czars (Kings and rulers)
- Earlier heading: Kings and rulers, Primitive
- Monarchs
- Royalty
- Rulers
- Sovereigns
- Tsars
- Tzars
- Broader heading: Heads of state
- Queens
2018023375: Morris, M. A. Writing the Time of Troubles, 2018: CIP introd. (This is a book about plays and novels focused on two of early-modern Russia's most enigmatic and contested tsars, Boris Godunov and the man known as False Dmitry.)
Merriam-Webster online, July 13, 2018: (czar: 1. emperor; specifically : the ruler of Russia until the 1917 revolution; 2. one having great power or authority; a banking czar)