A tsar was a leader. 

A tsar was a special title. 
Simeon I was the first person to use it. He was a leader in Bulgaria. 
Later, people in Serbia used the title too. Stefan Dušan was one of those leaders.
In Russia, the title became very famous. Ivan IV was the first Russian tsar. 
Many lands had tsars. It was a way to show great power.
A tsar was a special title for a leader. 
Simeon I was the first leader to use this title. He ruled the First Bulgarian Empire. 
The title became very famous in Russia. Ivan III used the title in letters to other lands. Later, Ivan IV became the first ruler formally crowned as tsar in 1547. 

A tsar was a very special title for a powerful leader. 
Using the title was often a way to show strength.
Other strong lands also used the title for their rulers. 
The title became most famous in the Tsardom of Russia. 
Even in more recent times, the title was still used. 
The title tsar, also spelled czar or tzar, was a prestigious name for Slavic monarchs. It is derived from the Latin word caesar. In the medieval European sense, caesar meant an emperor. This was a ruler with a rank equal to a Roman emperor. Such a leader often held power through the approval of another emperor or a high church official. While Western Europeans often viewed the title as equivalent to a king, its actual meaning was more complex. 
In the Byzantine Empire, there were specific terms for high imperial power. The Greek equivalent of the Latin word imperator was autokrator. Another term used was basileus, though its meaning changed depending on the political or Biblical context. The title tsar was used by several major states over many centuries. These included the First and Second Bulgarian Empires, the Serbian Empire, and the Tsardom of Russia. It was also used during the Kingdom of Bulgaria between 1908 and 1946.
Bulgaria provides a clear history of how the title was adopted. In 705, Emperor Justinian II named Tervel of Bulgaria a caesar. This was the first time a foreigner received that specific title. However, Tervel's descendants continued to use the Bulgar title Kanasubigi. The title tsar was officially adopted by Simeon I of Bulgaria. He received a makeshift imperial coronation from the Patriarch of Constantinople in 913.
Simeon I's use of the title led to significant diplomatic shifts. The Byzantine Empire initially tried to revoke the concession of the imperial title. This resulted in a decade of intensive warfare between the two powers. Eventually, the Byzantine government recognized the Bulgarian ruler's imperial title in 924. They recognized it again at the formal conclusion of peace in 927. According to Byzantine political theory, there was room for only two emperors: the Eastern and the Western. Therefore, the Bulgarian ruler was crowned basileus as a "spiritual son" of the Byzantine basileus.
Another major use of the title occurred in the Serbian Empire. In 1345, Stefan Dušan began calling himself the Emperor of Serbs and Greeks. His Greek titles were basileus and autokrator of Serbs and Romans. He was crowned in Skopje on April 16, 1346. The ceremony was performed by the newly elevated Serbian patriarch and the Bulgarian patriarch. 
The title reached its greatest fame in the Tsardom of Russia. While church officials in Kievan Rus' once used the term for Yaroslav the Wise, it was not a standard royal title there. Mikhail of Tver was the first Russian ruler to openly break with the khan of the Golden Horde by using the title basileus ton Ros and tsar. Later, Ivan III adopted the title of sovereign of all Russia in 1476. He used the title tsar regularly in diplomatic relations with Western nations. 
There were different perspectives on what the title actually meant. Some foreign ambassadors suggested tsar should not be translated as emperor. They noted that Russians applied the title to Biblical figures like David and Solomon. To these observers, the title was more honorable because it suggested God, not humans, ordained the ruler. Others, like the court physician to Tsar Alexis, felt the word had a close relation to caesar. This meant the Russians intended it to be a higher title than king. 
As the Russian Empire grew, the title's usage changed. In the 18th century, tsar was sometimes seen as inferior to the title emperor. It was occasionally used to highlight the oriental side of a ruler's rank. For example, after annexing Crimea in 1783, Catherine the Great used the title tsaritsa of Tauric Chersonesos. By 1815, when Russia annexed parts of Poland, the title was interpreted as equivalent to the Polish word król, or king. The Russian emperor then assumed the title tsar of Poland. The title remained part of the long, complex official titles of Russian rulers until the monarchy was abolished in 1946. The last person to hold the title was Simeon II of Bulgaria.
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