The County of Holland was a historical region in the western part of the Netherlands. It emerged in the 10th century and became a significant political and economic center during the Middle Ages. The county was known for its prosperous trade, agriculture, and fishing industries, contributing to the growth of cities like Amsterdam and Haarlem. In the 16th century, the County of Holland played a crucial role in the Dutch Revolt against Spanish rule, leading to the establishment of the Dutch Republic. The region's influence continued to grow, shaping the cultural and economic landscape of the Netherlands in subsequent centuries.