Margaret I of Denmark was a significant historical figure who ruled in the late 14th and early 15th centuries. Born in 1353, she became the Queen of Denmark, Norway, and Sweden, uniting these kingdoms under her leadership. Her reign marked the beginning of the Kalmar Union, which aimed to consolidate power in the Nordic region. Margaret was known for her political acumen and ability to navigate complex alliances. After the death of her son, she adopted a more direct role in governance, effectively ruling as a regent. She passed away in 1412, leaving a lasting legacy in Scandinavian history.