Answer: The brutality of his muder and the fact that his killers were acquitted drew attention to the long history of violent persecution of African Americans in the United States. Till posthumously became an icon of the civil rights movement.
First they refused to reopen the case. Then they did a quick trial in which they found that person not guilty. It wasn't till years later that Alfred Dreyfus was actually cleared of the false charges against him.
Captain Alfred Dreyfus (of Jewish ethnicity) had been accused of giving French military secrets to the Prussians. The real traitor was Major Ferdinand Esterhazy (who had framed Dreyfus). In 1896, when army intelligence chief Georges Picquart found evidence pointing to Esterhazy, he was rebuffed by army bosses and transferred to North Africa. When talk of Esterhazy's guilt persisted, the army court-martialed him but in a quick trial declared him not guilty. The role of the media, led by an accusing article by Emile Zola, kept the Dreyfus Affair alive in public interest with a desire to undo the wrong that had been done to the innocent Dreyfus. But it took till 1906 before Dreyfus was fully cleared of all guilt in the matter.
The authority of the Roman king was called Emperor, it reflects his taking of the title Augustus or Caesar. Another title often used was imperator, originally a military honorific. Early Emperors often used the term princeps (first citizen). I'm pretty sure I gave the correct answer if you asked what was the term was for Roman King.