Eustace II, Count of Boulogne, was a prominent nobleman in the 11th century, known for his role in the early medieval politics of Normandy and England. He was the son of Eustace I and became the Count of Boulogne around 1049. Eustace II was a key supporter of William the Conqueror during the Norman Conquest of England in 1066. Eustace II's influence extended beyond military support; he was also involved in the establishment of Norman rule in England. He held significant lands and was known for his connections to the Canterbury church. His legacy continued through his descendants, who played important roles in European nobility.