William the Conqueror, originally known as William the Bastard due to his birth to Robert I of Normandy and an unnamed woman, became Duke of Normandy in 1035 after his father's death. His ascension was fraught with difficulties, as he was only about seven years old at the time, and this led to significant political instability in the duchy. Following Robert's death during a pilgrimage to Jerusalem, the power vacuum attracted various nobles, who were keen to seize control. They questioned William's legitimacy due to his illegitimacy and youth, prompting several revolts against his guardians and supporters.

William's early rule was characterized by numerous conflicts with rival nobles and formidable opposition from within his own court. However, with the support of key figures such as his maternal uncle, the powerful Duke Richard II of Normandy, William gradually gained the upper hand. His reign was marked by numerous skirmishes, but he began to prove himself not only as a military leader but also as a shrewd political strategist. He successfully managed to fortify his position by systematically defeating his enemies and consolidating power throughout Normandy.

Over the years, William transitioned from a vulnerable young duke to an accomplished ruler, strengthening the duchy's governance and expanding its influence. By establishing administrative reforms and strengthening ties with the church, he increased Normandy's prestige. His experiences and triumphs in securing his rule laid the groundwork for his later ambitions, which would culminate in the historic conquest of England in 1066. William's ability to navigate a complex political landscape demonstrated his resilience and capabilities as a leader, which would eventually transform the trajectory of European history.