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Pretty sure it's Portugal.
Prince Henry started his navigation school in Sagres, Portugal.
Because of him, Portugal became the first country to explore. If he didn't start the "school of navigation" there would be no exploration. So he is the most important.
The School of Navigation was founded in the 15th century, during the Age of Exploration.
It was founded in Lisbon, Portugal by Henry "The Navigator."
Prince Henry School of Navigation at Sagres, Portugal - 1419
School of Navigation: About 1418, Prince Henry started the first school for oceanic navigation along with an astronomical observatory at Sagres, Portugal. In this school, people were trained in nagivation, map-making, and science, in order to sail down the west of Africa.
The compass and the astrolabe made navigation by sea, and therefore exploration, possible.
People in the 1400's didn't have high school. It didn't exist until 400 years later, so he didn't go to high school. He began as a ship's boy and went the school of Navigation by Prince Henry of Portugal.
Jesus
His school of navigation.
Dr.P.Narayana