Grand Duke William IV of Luxembourg was a ruler of the Grand Duchy of Luxembourg from 1890 until his death in 1912. He was born on April 22, 1852, and became the Grand Duke after the abdication of his aunt, Grand Duchess Adélaïde. His reign was marked by efforts to modernize the country and improve its infrastructure. William IV was known for his commitment to the welfare of his people and his interest in cultural and educational initiatives. He played a significant role in promoting Luxembourg's identity and independence, navigating the complexities of European politics during his time.