The element mercury has no single credited discoverer. It has been known since ancient times and appears in Egyptian tombs dating to around 1500 BCE, with knowledge also present in early Chinese and Indian cultures. Because it was known long before modern chemistry, there isn’t a specific individual who can be named as the discoverer. If you’d like, I can summarize what ancient sources and historians say about its first recorded uses and the evolution of its naming (hydrargyrum, quicksilver) through different cultures.