This ancient book tells the story of a mythical king and a worldwide flood. the epic of gilmont the epic of gilliam the epic of gilgamesh the epic of gilrad

The correct answer is - The Epic of Gilgamesh.

''The Epic of Gilgamesh'' is a book written in Sumerian language, with Sumerian alphabet, and it is one of the best known books of this ancient civilization, as well as a nice testimony for their writing skills. This book, has been of great importance in the Sumerian mythology, but also it had an influence on the mythology of the whole region, and further, as it can easily be seen in the mythology of the Israelite for example, where they have adopted the story, but just made slight modifications, and we now know it as the ''Noah's Arc''.