What is "tzars"

Usage examples of "tzars".

He was a Russian Jew, he said, one of the millions of the largest Jewry in the world that had been 'frozen' for over a century in the notorious Pale of Settlement, and in 1905 had been forced to flee with his father - leaving mother and two brothers behind - to escape the ruthless massacres carried out by the 'Black Hundreds' at the behest of the last of the Romanoff Tzars who was seeking scapegoats for his crushing defeat by the Japanese.