Since the Sumerian language has only been widely known and studied by scholars for approximately a century, changes in the accepted reading of Sumerian names have occurred from time to time. Thus the name of a king of Ur, read "Ur-Bau" at one time, was later read as "Ur-Engur", and is now read as Ur-Nammu or Ur-Namma; for Lugal-zage-si, a king of Uruk, some scholars continued to read "Ungal-zaggisi"; and so forth. Also, with some names of the older period, there was often uncertainty whether their bearers were Sumerians or Semites. If the former, then their names could be assumed to be read as Sumerian, while, if they were Semites, the signs for writing their names were probably to be read according to their Semitic equivalents, though occasionally Semites might be encountered bearing genuine Sumerian names. There was also doubt whether the signs composing a Semite's name represented a phonetic reading or a logographic compound. Thus, e.g. when inscriptions of a Semitic ruler of Kish, whose name was written "Uru-mu-ush", were first deciphered, that name was first taken to be logographic because "uru mu-ush" could be read as "he founded a city" in Sumerian, and scholars accordingly retranslated it back to the original Semitic as "Alu-usharshid". It was later recognized that the URU sign can also be read as "rí" and that the name is that of the Akkadian king Rimush.