Axel Oxenstierna was a Swedish statesman who served as the Lord High Chancellor of Sweden from 1612 until his death in 1654. He played a key role in the government and administration of Sweden during the Thirty Years' War and was a close advisor to King Gustavus Adolphus. Oxenstierna is known for his diplomatic skills and his efforts to modernize and centralize the Swedish government. He also played a significant role in shaping Sweden's foreign policy and expanding its influence in Europe. Oxenstierna is considered one of the most influential figures in Swedish history and is often regarded as the father of modern Sweden.