Aqua Regia is Kings Water; this is because it has enough power to dissolve gold - the king of metals. It is prepared by mixing three parts hydrochloric acid and one part nitric acid, but in the old days it was prepared for mixing and roasting salt. For example, we can mix two parts niter and one part Sal. Ammonia and distilled at high temperatures from Aqua Regia.

"Sulfuric acid" is also called the king of acids and "Nitric acid" is known as the Queen of acids.