All Thinkers

Thinkers Timeline

Key thinkers across history — grouped by era, colour-coded by discipline. Click any card to explore ideas, quotations, and classroom contexts.

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Early Modern — 1500 to 1800
Hugo Grotius 1583-1645 · Dutch Republic (Netherlands)
Hugo Grotius was a Dutch jurist, philosopher, and diplomat. He is often called the father of international law. He was born on 10 April 1583 in Delft, in the Netherlands. His Dutch name was Huig de Groot. The Latin form, Grotius, is the name he is now known by in most of the world. His family was educated and well-connected. His father had been mayor of Delft and a curator of Leiden University. Grotius was a child prodigy. He entered Leiden University at age eleven. He earned a doctorate in law in France at fifteen. He published his first books in his teens. He became a working lawyer and politician in his twenties. By thirty he was one of the most respected scholars in Europe. His political career ended badly. The Netherlands in his time was torn by religious and political conflict. Grotius supported one faction. When the other side won, he was sentenced to life imprisonment in 1619 in Loevestein Castle. After almost two years, his wife smuggled him out in a chest of books. He fled to Paris. It was in Paris, in 1625, that he published his masterpiece: De Jure Belli ac Pacis, On the Law of War and Peace. The book established the foundations of modern international law. Europe at the time was tearing itself apart in the Thirty Years War. Grotius wanted to find rules that could limit the violence and bring some order to relations between nations. He later served as Sweden's ambassador to France. He died on 28 August 1645 in Rostock, Germany, after his ship was wrecked on the Baltic coast. He was 62.
"I observed in the whole Christian world a license of fighting at which even barbarous nations might blush."
Baruch Spinoza 1632-1677 · Netherlands (Portuguese Jewish family)
Baruch Spinoza was a Dutch philosopher. He is one of the most important thinkers of the early modern period. He was born on 24 November 1632 in Amsterdam. His family was Portuguese Jewish. They had fled Portugal to escape violent persecution by Catholic rulers. The Netherlands at the time was unusual in Europe. It was more tolerant of Jews than most countries. But Jewish communities there stayed careful, afraid of upsetting their Christian neighbours. Young Baruch (Hebrew for 'blessed') was a brilliant student of Hebrew and Jewish religious texts. His father ran a small trading business. When the father died, Spinoza helped manage it for a short time. But by his early twenties, he was moving away from traditional Jewish belief. He read Descartes and other new European philosophers. He began to question the Bible. He asked whether miracles really happened. He doubted that God was a person who ruled the world from outside it. In 1656, when he was 23, the Jewish community of Amsterdam formally expelled him. The document is one of the harshest such orders in Jewish history. It cursed him and forbade any Jew from speaking to him or even coming within four paces of him. The exact reasons were not recorded. His dangerous religious ideas are the most likely cause. He never tried to rejoin. He made his living grinding lenses for microscopes and telescopes. This was precise, patient work. He lived simply, in rented rooms, never marrying. He refused a university chair at Heidelberg because he feared it would limit his freedom to think. He published only two books in his lifetime, one of them anonymously. His greatest work, the Ethics, came out after his death. He died on 21 February 1677, aged 44, probably from a lung disease made worse by glass dust from his work.
"God, or Nature."