Lignum nephriticum cup crafted from narra wood (the namesake on the province) produced opalescent colours when water is poured into it. These wood cups ended up a major pre-colonial and colonial marketplace of Naga. Naga would be the native pre-colonial title of town. It's named once the narra tree https://marcotepal.blogripley.com/28722815/a-simple-key-for-23naga-unveiled