On this day 270 years ago, on November 1, 1755 (September 27, 1755 in the lunar calendar), the Lisbon earthquake. The Lisbon earthquake that occurred on November 1, 1755, was the largest earthquake in Europe so far. The earthquake occurred at the bottom of the Atlantic Ocean, dozens of kilometers away from the city of Lisbon. The damage to the city of Lisbon was extremely severe. About 70,000 people died. Many of them died due to a series of tsunamis of more than ten meters caused by the earthquake. The earthquake caused a tsunami nearly 30 meters high, which hit the coast of Lisbon and caused damage to the coasts of England, North Africa and the Netherlands. Even in Central America, considerable waves were observed. 214 years after the earthquake, on February 28, 1969, another magnitude 8 earthquake occurred in the west of this sea area. Before the 18th century, the European theological community was very powerful and people were not allowed to study earthquakes. After the Lisbon earthquake, earthquake research in Europe was freed from the shackles of religion.