Alexander the Great, the king of Macedon, began a campaign to conquer India in 326 BC, after conquering the Achaemenid Empire of Persia. He fought a notable battle against Porus of the Paurava kingdom on the banks of the Jhelum river. Mother Teresa, who became an Indian citizen in 1951, was born in Skopje (in present-day North Macedonia) in 1910.