Duke Eric IV of Saxe-Lauenburg was a noble ruler in the 15th century, known for his leadership in the region of Saxe-Lauenburg. He was part of the House of Ascania, a prominent dynasty in northern Germany. His reign was marked by efforts to strengthen his duchy and maintain stability during a time of political challenges. Eric IV's rule lasted from 1422 until his death in 1450. He was involved in various conflicts and alliances, which were common among the German principalities of the time. His legacy includes contributions to the governance and development of his territory, influencing the region's history.