One such sentence would be this: "The compass was a vital piece of technology that allowed sailors and explorers of all kinds find their position in the world relative to the North Pole".
An important scientist at the time, besides, those who were mentioned was Copernicus - A.
Spartacus was just a slave general in the Roman republic.
Rousseau was a philosopher.
Plato was a philosopher as well.
The correct answer for that reason is Copernicus, he was an astronomer and a major figure at the time.
The Thirty Years' War was a war fought primarily in Central Europe between 1618 and 1648. One of the longest and most destructive conflicts in human history, as well as the deadliest European religious war in history, the war resulted in eight million fatalities.
In 55 B.C.,with the support of the Romans, Ptolemy XII was put back on the throne and took his 17-year-old daughter Cleopatra as his co-ruler it would be Julius Caesar who helped Cleopatra regain her throne
