Sumerian was the language of ancient Sumer. It is one of the oldest attested languages, dating back to at least 2900 BC. It is a local language isolate that was spoken in ancient Mesopotamia, in the area that is now modern-day Iraq. Sumerian is read from left to right, from the top; however early inscriptions were read top to bottom from the right. Akkadian, a Semitic language, gradually replaced Sumerian as the primary spoken language in the area c. 2000 BC (the exact date is debated), but Sumerian continued to be used as a sacred, ceremonial, literary, and scientific language in Akkadian-speaking Mesopotamian states, such as Assyria and Babylonia, until the 1st century AD. Thereafter, it seems to have fallen into obscurity until the 19th century, when Assyriologists began deciphering the cuneiform inscriptions and excavated tablets that had been left by its speakers. In spite of its extinction, Sumerian exerted a significant influence on the languages of the area. The cuneiform script, originally used for Sumerian, was widely adopted by numerous regional languages such as Akkadian, Elamite, Eblaite, Hittite, Hurrian, Luwian and Urartian; it similarly inspired the Old Persian alphabet which was used to write the eponymous language. The influence was perhaps the greatest on Akkadian, whose grammar and vocabulary were significantly influenced by Sumerian. Source: Wikipedia (en)