Which country was the first known to brew light-colored beer?

The first known light-colored beer was brewed in Belgium, specifically in the region of Flanders.

While the exact date is unknown, evidence suggests that brewing light-colored beers in Flanders began around the 14th century. These beers, known as witbier, were made with wheat and coriander, giving them their distinctive pale color and refreshing taste.

It's important to note that while these beers were lighter in color than the dark ales commonly brewed at the time, they weren't necessarily "blonde" in the modern sense. They were still cloudy and often had a slightly golden hue.