Sumerian

In Sumerian "LÚ.GAL" means the ruler or king.

I don't know who invented the dictionary. Was it a Sumerian? Was it a Chinese? I know one thing though, the dictionary is a wonderful invention.

Sumerian is thought to be the oldest known written language.

Tradition holds that writing first appeared in the Sumerian period, three and a half millennia before the common era.

I'm learning Sumerian.

Sumerian is interesting.

Don't underestimate the Sumerian.

I find Sumerian characters interesting.

The Abrahamic religions are offshoots of the Sumerian mythology.

If I wanted to learn Sumerian I would download a textbook or two, work my way through it, and also find university resources on the language, such as dictionaries and grammars hosted by universities. For a lot of dead languages, universities and university-quality scholarly websites host a ton of resources. Sumerian will be more sparse than Latin or Greek, maybe even than Old English, but I can't imagine there are no good free resources hosted by universities.